study guide Learn with flashcards, games, and more — for free. mammary gland: A gland that secretes milk for suckling an infant or offspring. Be able to identify the histological components of the mammary gland, specifically the structures associated with the nipple and the areola, the overall organization into lobes and lobules, as well as secretory alveoli (acini), lactiferous ducts and sinuses and the intralobular and interlobular connective tissue. By Gerald Ortiz. It’s a natural behavior of the mammalian babies to go and lick the mother’s teats. Most likely, it evolved as a sexual signal communicating fertility (1). The production of breast milk initiates in larger amounts between 2 and 4 days after the birth of the baby and the breastmilk is said to have 'come in'. The structure of the female breast is complex — including fat, glandular and connective tissue, as well as lobes, lobules, ducts, lymph nodes, blood vessels and ligaments. This is because. characterize a macrophage population associated with mammary ducts that are long lived, derive from embryonic precursors and have multiple roles in pregnancy, lactation, involution. 8K. Mammary Glands. This is in contrast to the cow which. Some mammals lay eggs. These rudimentary mammary glands are identical in males and females. These growths originate in the epithelial tissue of a gland beneath a nipple and eventually spread (metastasize) to the lymph nodes, lungs, pleura, liver, adrenal gland, kidney, or other parts of the body. Peaches & Eggplants (feat. But as Feldhamer points out, lactation can differ greatly among those of us in the milk-maker tribe. From the 70 s, in vitro mouse mammary culture evolved from basic monolayers of cells to complex 3D culture systems considering the importance of the cell polarization and microenvironment. Mamariles Retweeted. The lower jaw of mammals consists of only one bone, the dentary. A breast infection caused by inflammatory breast cancer also causes redness and. The mammalian integument includes various secretory glands, including sebaceous glands, eccrine glands, apocrine glands, and mammary glands. When comparing feline and canine mammary glands, the first three pairs would be thoracic and the caudal pair abdominal or inguinal; numbered first to. They characterize key life stages in which the mammary gland undergoes complex. This is treated with. 72. In addition to these characteristic milk glands, mammals are distinguished by several other unique features. Mammary glands develop next and consist of 15 to 24 lobes. Promoter regions with both nulliparous and parous DMRs are represented in blue (present in both). The ectoderm layer forms the neural tube that closes at six weeks of gestation. The breast has an inhomogeneous structure that is predominantly composed of adipose tissue and glandular tissue. A persistent fever and no improvement of symptoms within 48-72 hours of treatment. At birth, the breast is composed of radially arranged mammary lobes draining via lactiferous ducts into ampullae that empty onto the nipple. The endocrine system coordinates development of the mammary gland with reproductive development and the demand of the offspring for milk. 72. The reproductive glands produce secretions that become part of semen, the fluid that is. A cat has two “chains” of four mammary glands and nipples running parallel on each side of its belly. original sound - EX7STENCE™. Fate-mapping studies have shown that in many tissues F4/80 is a very useful surface marker for discriminating different subpopulations of. The human breast epithelium is a branching ductal system composed of an inner layer of polarized luminal epithelial cells and an outer layer of myoepithelial cells that terminate in distally located terminal duct lobular units (TDLUs). Abstract. 1 29. Breast development, also known as mammogenesis, is a complex biological process in primates that takes place throughout a female 's life. Introduction. Three categories of hormones are involved. Stage 3. 3. By Will Welch. Although the extra mammary gland is present from infancy, most people aren't aware of it until puberty. Generally, there are 5 stages of breast development in girls. The areolas, the darker circular area around the nipple, are located where the mammary gland ducts reside in women's breasts. Development of the Human Breast. Of or relating to a breast or mamma. Regulated by epithelial/mesenchymal interactions, the placodes descend into the underlying mesenchyme and produce the rudimentary ductal structure of the gland present at birth. The first transpires in the embryo as the ectoderm forms a mammary line that resolves into placodes. (credit: NCI) The left-hand sample is the first milk produced by the mother while the right-hand sample was produced later during the same pumping. the dog's type or breed. Pubertal changes lead to incomplete development of the breast , a process which is only completed during pregnancy . 2. As the breasts continue to develop along the ridge over the chest, these lines eventually disintegrate, usually by about week nine of fetal life. Preteen. You may like. The photo, posted on Twitter earlier this. Introduction. Foley, in Fundamentals of Toxicologic Pathology (Third Edition), 2018 Abstract. AboutTranscript. Slide show: Female breast anatomy. Both males and females have glandular tissue within the breasts. . Part of how the mammary gland fulfills its function of producing and delivering adequate amounts of milk is by forming an extensive tree-like network of branched ducts from a rudimentary epithelial bud. Thus each teat typically has two orifices through which the main ducts discharge (Fig. Regardless of gender, all people have mammary glands when they are born. This protein, called stromelysin-3 (ST3) appears in the case of malignant tumors, having extremely high. The breasts are the most prominent superficial structures in the anterior thoracic wall consisting of glandular tissue and a supporting fibrous and fatty matrix. Depression. . Structure. The existence of mammary stem cells has been inferred from genetic analysis of human breast tissue, and from the fact that mouse mammary gland can regenerate from tissue fragments. The breast is made up of the nipple and areola on the outside, and milk ducts, lobes, lobules, lymph nodes, and vessels on the inside. Background Both male and. happy snarking besties. All male and female mammals have mammary glands , which is the organ that produces milk. 18,464 results for mammaries in all. Previous Next 1 of 6 Female breast anatomy. The mammary gland is a defining organ for mammals. Mammary duct ectasia is when the milk ducts under the nipple become clogged up with fluid. Figure 29. A mammary gland is an organ in female mammals that produces milk to feed young offspring. Mammary gland development is a multistage process that begins during embryogenesis, but mainly occurs after birth. Sometimes. The primary function of the female breasts is to produce breast milk and breastfeed a baby. buds appear, breast and nipple raised, and the areola (dark area of skin that surrounds the nipple) enlarges. Even more important, the sexual revolution that Hugh Hefner's mag. They are also classified as tubualveolar glands and. Funding: Funding: NIH s National Cancer Institute (NCI) and National Human Genome Research Institute (NHGRI); and the Howard Hughes Medical Institute. Oily phans on IG : itsmamariles. Refer to the diagram at the end of this chapter for the. The mammary gland development. Each breast has 15 to 20 sections, called lobes. A free Educational Medical Resource from Medika Life. an ectopic milk duct that leaks milk through the skin without visible breast tissue or nipple. A top-10 parenting group according to ComScore, Wild Sky Media’s robust portfolio of parenting websites includes Mom. Vaginal smears were obtained daily before and. ∗ Patient history includes the following: breast symptoms, other concomitant symptoms, duration of symptoms, factors associated with aggravation/relief of symptoms, past history of breast or ovarian diseases, family history of breast cancer, and history of intake of reproductive hormones/oral contraceptives. Breasts are slightly larger, with glandular breast tissue present. It is involved in secreting, synthesizing and delivering milk to the neonate for its optimal protection, nourishment and development. The mammary gland, or mammary duct, is. The mammary gland is a structure unique to the members belonging to the class Mammalia. Regulated by the endocrine system, mammary glands respond to the hormonal changes that take place during pregnancy and following birth. Manoj Kumar Jena Shalini Jaswal. . A few other animals feed their young with a milk-like substance (such as the. About half of all tumors in female dogs are mammary tumors. Stage 2. NCI's Dictionary of Cancer Terms provides easy-to-understand definitions for words and phrases related to cancer and medicine. The parenchyma forms a system of branching ducts eventually leading to secretory acini development and the stroma consists mainly of adipose tissue, providing the environment for development of the parenchyma. Stage 3. The capacity to supply fluid and perhaps nutrients to eggs would be promoted and enhanced by incorporation of antimicrobials into the fluid. These may have been antimicrobials already produced in the skin, as in amphibian skin, and evolutionary pressure would probably have fostered the incorporation of molecules such as lysozyme and iron-binding proteins into the secretion, components that are. Cats normally have eight mammary glands, four on each side: two thoracic (T1, T2) and two abdominal (A1, A2; A2 also referred to as the inguinal or the second abdominal mammary gland). The mammary gland is a compound, branched tubuloalveolar structure and a major characteristic of mammals. 5K Likes, TikTok video from Mamariles (@mamariless). These are the superior thoracic, thoracoacromial, lateral thoracic and subscapular arteries. Cats normally have eight mammary glands, four on each side: two thoracic (T1, T2) and two abdominal (A1, A2; A2 also referred to as the inguinal or the second abdominal mammary gland). However, direct study of IMI impacts on non-lactating but. 3. When it reaches the sixth or seventh intercostal cartilage, it divides into two branches, the musculophrenic and the superior epigastric. 2. Here, we knocked down miR-142-3. Other anatomical features derived from the integument are quills, horns, hooves, nails, claws, and baleen. Development includes puberty, pregnancy, and lactation. Mammary glands are unique to mammals, with the specific function of synthesizing, secreting, and delivering milk to the newborn. Two groups now. The size of the mass (es) and their appearance may vary, but they are usually firm and nodular. 1. Explore and share the best Mammaries GIFs and most popular animated GIFs here on GIPHY. The female breast consists of 10–20 lobes that are surrounded by connective and. Estrogen hormone helps in increasing the size of the breast during pregnancy causing the growth of breast tissue. 002. 6. I have met some incredibly talented people along the way in such a short space of time. It may be noted during a breast self-exam or during a screening mammogram, the X-ray test that looks for suspicious areas in the breasts. The extent of epithelial proliferation within the gland is massive and often occurs during a very short interval; this topic has been reviewed extensively elsewhere (Hovey et al. A key characteristic of synapsids is. Myoepithelial cells considered terminally differentiated are now shown by Stingl and colleagues to have stem cell properties in vitro, to repopulate a mammary gland on transplantation and to. They may be next to or within the nipple and follow along the mammary chain (see illustration). Cooper's ligaments (also known as the suspensory ligaments of Cooper and the fibrocollagenous septa) are connective tissue in the breast that help maintain structural integrity. It is the primary source of nutrition for young mammals (including breastfed human infants). [1] It is a structural disorder of the mammary glands due to different degrees of hyperplasia and subinvolution of the mammary parenchyma and stroma. Mother, 29, with 38KK breasts says her giant chest is ruining her life by causing painful sores and back and shoulder aches which keep her up at night. These end in dozens of tiny bulbs that can produce milk. The lower jaw of mammals consists of only one bone, the dentary, and the jaw hinge connects the dentary to the squamosal (flat) part of the temporal bone in the skull. Peaches & Eggplants (feat. Each mamma is usually drained by two independent mammary ductal trees, although three may rarely occur []. Anatomical terminology. Norris PhD, James A. The mammary glands have a large blood supply, and veins are more extensive than arteries. Breast changes continue to happen over a woman’s life. The big difference is that they contain more fat than other female mammals. This condition occurs in 2-6% of women and 1-3% of men. Whereas mammary gland enlargement is frequently the result of pathological changes, drug treatment may produce an increase in mammary gland size analogous to the physiological changes seen in pregnancy or lactation. mammary: [adjective] of, relating to, lying near, or affecting the mammae. Do whales produce milk? Do whales have nipples? What's whale milk like? How does it all work underwater? Find out here!The most common clinical sign of a malignant mammary tumor is one (or more) palpable masses underneath the skin of the abdomen. Keywords: mammary stem cell, development, breast. An early tumor feels like small pieces of pea gravel. Media in category "Mammary glands". The bacteria associated with mastitis include Escherichia coli, Staphylococcus spp, and Streptococcus spp, which are all found in the normal skin flora of the bitch. Mammary tumor. Over the past several decades, lactation research has revealed the MG as a. The endocrinology of mammalian reproduction. 23674217. Mammals are warm-blooded animals that give birth to live young, while reptiles are cold-blooded animals that lay eggs. The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. mammal: [noun] any of a class (Mammalia) of warm-blooded higher vertebrates (such as placentals, marsupials, or monotremes) that nourish their young with milk secreted by mammary glands, have the skin usually more or less covered with hair, and include humans. Mammals have hair or fur, while reptiles have scaly skin. Pus or discharge from the teats. [ 1, 2] Breast milk is composed of many essential substances for optimal growth and development, including carbohydrates, fats, and proteins. 1. Each lobe is made up of several lobules, and each lobule is made up of. 2. , 2017). 4K Followers. Figure 28. ; lactiferous duct: The components that form a branched system connecting the lobules of. Robert D. Various imaging techniques may be applied in research or clinical practice to evaluate pathological conditions of mammary glands and contribute to a diagnosis. The mammary glands are located in the breasts. The mammary glands (MG) are unique among organs with respect to the large amount of postnatal development they undergo. Browse 47,657 mammary_glands photos and images available, or start a new search to explore more photos and images. The areola and nipple become raised and form a second mound above the rest of the breast. As shown in Figure [Math Processing Error] 22. Mammary glands are organs that produce milk for nursing infants. mammary: [adjective] of, relating to, lying near, or affecting the mammae. In addition, there are also suspensory Cooper's ligaments and connective tissue such as collagen and elastin. The condition is often divided based on the severity into two types, macromastia and gigantomastia. Key Terms. Worsening mastitis in cats causes symptoms like: Fever. Mastitis can become fatal if not treated quickly. To meet neonatal nutritional requirements, specific receptors and intracellular transport pathways [3] within the sMECs are used to transfer nutrients and milk component precursors from the serum across the basal plasma membrane to sites of synthesis or secretion. The amount of fat surrounding this glandular tissue. The dark area of skin around the nipple (the areola) gets larger. It is the sole best source of nutrition for an infant, providing an adequate amount of nutrients, growth factors, and antibodies required for the nourishment of the baby. Breast/mammary cancer is the most frequently diagnosed cancer in women and in female dogs [1,2]. It is involved in secreting, synthesizing and delivering milk to the neonate for its optimal protection, nourishment and development. Hyperplasia of the mammary glands (HMG) is a non-inflammatory and non-tumorous lesion. Mastitis is an infection of the mammary glands in nursing female animals. Oily phans on IG : itsmamariles. The researchers discovered a new family of locally secreted and locally acting molecules in the breast called "mammokines" that contribute not only to normal mammary biology, but to overall fat. Mammary Gland. mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. Functionally, the mammary glands produce milk; structurally, they are modified sweat glands. The teat sinuses are small uniformly wide passages. 6. lactiferous duct: The components that form a branched system connecting the lobules of the mammary gland to the tip of the nipple. Due to the clinical importance of human breast cancer, mammary glands have been studied extensively. The microenvironment surrounding mammary tissue plays a pivotal role in the gland development, predominantly via regulation of epithelial-to-mesenchymal transition (EMT), during which epithelial cells lose cell polarity and cell adhesion to become mesenchymal cells with migration and invasion properties. The internal thoracic artery travels along the inner surface of the anterior chest wall on both sides. Definition of Mammaries in the Medical Dictionary by The Free Dictionary 1. This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids. Mastitis (mammary gland infection while lactating) Galactostasis (milk collection in mammary gland while weaning) Feline Mammary Hypertrophy (benign masses)The most important reason why mammals produce milk is to nourish their young ones from birth to a period of three to five years of age. However, there are animals other than mammals that produce milk-like substances to feed their young. Latto & Sexyy Red) - Young Nudy. Mammary gland hyperplasia is a benign condition in which an an excessive amount of tissue grows, resulting in enlarged masses in the mammary glands. Trauma to the nipple or teat canal can allow bacteria to enter, traveling up into the mammary gland and creating a bacterial infection. Though it is present in both sexes, it is well developed in females and rudimentary in males. 464 Likes, TikTok video from Mamariles (@mamariless). Anatomical terminology. Structural development of the mammary gland occurs during fetal growth, prepubertal and post-pubertal periods, pregnancy, and lactation. A Playboy spokesman says that online porn killed the audience for the mag's brand of nudity, and there's a lot of truth to that. The areola and nipple become raised and form a second mound above the rest of the breast. Structure of the nipple (left) with three milk ducts, and the teat (right) with a secondary canal and three milk ducts. The breasts are paired structures located on the anterior thoracic wall, in the pectoral region. Mammary glands are a defining feature of mammals, but humans seem unique in granting mammaries a large sexual role. This blockage can occur. The time it takes to dry up the mother dog's milk supply will vary depending on several factors, including: how much you keep the pups and mother separated, your feeding protocols, and. Nipple and mammary gland (swelling) is a common symptom that has a number of causes. In this stu. Mammary glands produce milk as a source. In which, common sites include armpits (60-70%), chest wall, vulva, knees, side of thighs, buttocks, face, ears, neck. Fig. Both females and males develop breasts from the same embryological tissues. Breast cancer is one of the most common and well-known types of cancer among women worldwide and is the most frequent neoplasm in intact female dogs. The mammary duct is an organ known as an exocrine gland, which is a type of gland that secretes a substance. 3 million views, the well-endowed. Same. Some transgender men and nonbinary people use the term chestfeeding or bodyfeeding rather than breastfeeding. 70 Following. Male and female breasts are different due to the. The areola and nipple become raised and form a second mound above the rest of the breast. The dark area of skin around the nipple (the areola) gets larger. 58. Elevated levels of estrogen also cause a decrease in adipose tissue and ductal proliferation and elongation. Breast cancer is one of the most common causes of cancer-related death in women. The dark area of skin around the nipple (the areola) gets larger. Hormones control milk production during pregnancy and. TikTok video from Mamariles (@mamariless). Female Breast Developmental Stages. Yes, dolphins are mammals and not fish. The highly conserved Notch signaling pathway functions as a key regulator of the niche mediating mammary organogenesis and breast neoplasia. The hip-hop artist has shared pics of herself gracing the cover of Elléments Magazine. There are only 13 publications describing mammary gland neoplasms, with only 16 reported carcinomas and a carcinoma prevalence rate of 0. Pus draining from the nipple. Whole mounts of mammary gland are an inexpensive method to capture the progression of morphological changes that may arise after environmental pollutants exposure (Tucker et al. It's not necessarily a hard limit, but survival tends to drop noticeably when number of offspring being nursed exceeds number of mammaries. Each lobe is made up of several lobules, and each lobule is. Female mammals produce milk for their offspring and thus spend a good portion of their time and energy raising their. In the most viral clip with more than 2. Pus or discharge from the teats. This arrangement of jaw and ear bones aids in distinguishing fossil mammals from fossils of other synapsids. 6. Early detection and treatment are crucial. 18,464 results for mammaries in all View mammaries in videos (1272) 00:27 4K HD 00:11 4K HD 00:10 4K HD 00:15 4K HD 00:10 4K HD 00:13 4K HD 00:21 HD 00:10 4K HD of. The big difference is that they contain more fat than other female mammals. Trauma to the nipple or teat canal can allow bacteria to enter, traveling up into the mammary gland and creating a bacterial infection. Even in the absence of trauma, a female dog living in unsanitary. The female reproductive system is made up of internal and external organs that function to produce haploid gametes called eggs (or oocytes), secrete sex hormones (such as estrogen), and carry and give birth to a fetus. The mammary gland undergoes dramatic post-natal growth beginning at puberty, followed by full development occurring during pregnancy and lactation. In patients with breast pain, the. The nipple appears as a small pit in the center of a thickened areola containing a few glands of Montgomery. Stage 3. The lobules and ducts are surrounded by a layer of adipose tissue, which provides insulation and helps protect the. Stage 5. The Mamaril family name was found in the USA, and the UK between 1891 and 1920. Sort of like milk, but permanent. Mammary glands are found in both sexes, but cease development in males well before puberty. The teat sinus extends upward from the teat canal into the gland. Mammary epithelial cells (MECs) are the only cell type that produces milk during lactation. Breast milk contains all the nutrients that an infant needs in the first 6 months of life, including fat, carbohydrates, proteins, vitamins, minerals and water (1,2,3,4). Furthermore, the mammary gland plays a. Bones of the mammalian inner ear are modified from bones of the jaw and skull. ; beta-1 integrin: One of the regulators of mammary epithelial cell growth and differentiation. The gland undergoes. The milk helps to keep the baby healthy and develop very fast. Background. she’s a big only fans girl. she was in a relationship with drew, her baby daddy. They showed that the mean number of main ducts at base of nipple was 9. Published by. mammary gland: [noun] any of the large compound modified sebaceous glands that in female mammals are modified to secrete milk, are situated ventrally in pairs, and usually terminate in a nipple. The breasts, located on the front of the chest, are medically known as the mammary glands. The human mammary gland is a highly evolved skin gland, which is best described as an apocrine (ie, milk components are synthesized and secreted without destruction of the glandular cells) or merocrine (ie, the gland is repeatedly functional without cellular destruction) glandular structure. mammary definition: 1. To further understand how cellular diversity changes during mammary ontogeny, we profiled single cells from nine different developmental stages spanning late embryogenesis, early. differentiation. Rutteman, E. Shrinkage (involution) of the milk ducts is the final major change that happens in the. The teat sinus extends upward from the teat canal into the gland. com. Recommended. These macrophages are monocyte. Mammary glands are the organs that, in the female mammal, produce milk for the sustenance of the young. Feline mammary hyperplasia is a benign, progesterone-associated fibroglandular proliferation of one or more mammary glands that may occur in both the female and male cat. The permanently enlarged human breast is a peculiarity of our species. The term "breast" is sometimes used to refer to the area at the front of the chest. Amphibians are the cold-blooded, vertebrate animals that possess an aquatic gill-breathing larval stage and terrestrial, lung-breathing adult stages. lobular units that form the milk duct system and drain via the major milk ducts and the. Breast cancer has been a gift on so many levels. In development, the mammillary bodies form from the ectoderm layer. INTRODUCTION. Breast cancer, which most often forms in the mammary glands or breast ducts, is the biggest threat to breast health. The levels of the reproductive hormones, estrogen, progesterone, placental lactogen, prolactin, and oxytocin, change du. Molecular mechanism of mammary gland involution: An update. Based on gene expression profiling, breast tumors can be classified into five subtypes: Luminal A (expressing estrogen and progesterone receptors; ER +. 10. Regulated by epithelial/mesenchymal interactions, the placodes descend into the underlying mesenchyme and produce the rudimentary ductal structure of the gland present at birth. Following lactation, the alveoli undergo apoptosis, and the mammary gland reverses back to resemble the nonparous gland. The teat sinuses are small uniformly wide passages. Mammary Glands. 1 – Let-Down Reflex: A positive feedback loop ensures continued milk production as long as the infant continues to breastfeed. Breasts are slightly larger, with glandular breast tissue present. Milk is a white liquid food produced by the mammary glands of mammals. The mammary glands are responsible for lactation, also known as milk production. Yes, dolphins are classified as mammals and not fish. Definition of Mammaries in the Medical Dictionary by The Free DictionaryThe skeletal system of mammals possesses many unique features. The mammary gland is a compound, branched tubuloalveolar structure, and a major characteristic of mammals. Introduction. Lobules and ducts. Neoplasms, including carcinomas, are difficult to diagnose and treat, particularly in. ydbio. Most irritations are normal, but some symptoms may point to early breast cancer, which primarily. If you number a dog’s teats from 1-5, with 1 being the teat closest to the head and 5 being the teat closest. Histological changes are primarily associated with changes due to milk accumulation within the lumen of the alveolus. You’re highly unlikely to start sprinkling milk out of. Mammary Glands (Breast) The breast or mammary gland is a highly efficient organ mainly used to produce milk and is a mass of glandular, fatty, fibrous tissues. mammal: [noun] any of a class (Mammalia) of warm-blooded higher vertebrates (such as placentals, marsupials, or monotremes) that nourish their young with milk secreted by mammary glands, have the skin usually more or less covered with hair, and include humans. In this review, Visvader and Stingl integrate recent data on the mammary stem cell differentiation hierarchy and its control at the transcriptional and epigenetic levels. The mammary gland develops through several distinct stages. It is also a vital accessory organ. The American Academy of Pediatrics (AAP) and the World Health Organization (WHO) both recommend exclusive breastfeeding until an infant is at least 6 months of age. e. Hyperplasia of the mammary glands (HMG) is a non-inflammatory and non-tumorous lesion. These ducts include the epididymis, vas deferens, ejaculatory duct and urethra. The thoracic (chest) mammary glands receive their arterial. These hormones promote gland development from puberty onwards and induce the formation of a branched, epithelial, milk-secreting organ by the end of pregnancy. We provide a brief overview of the development and anatomy of nipples. The evolutionary origins of this trait have been the focus of many. The human mammary gland is composed of 15-20 lobes that secrete milk into a branching duct system opening at the nipple. The areola is a circular pigmented area on the skin of the breast that surrounds the nipple. The mammary immune and physiological responses to distinct mammary-pathogenic E. The mammary gland development begins during embryogenesis as a rudimentary structure that. The equine udder comprises one pair of mammae each with a teat. 15-20 lobes separated by adipose tissue. The mammary gland is a highly evolved and specialized organ present in pairs, one on each side of the anterior chest wall. In females, it serves as the mammary gland, which produces and secretes milk to feed infants. Stage 1. D. Lukas Dvorak / Eyeem / Getty Images. Lactation. 1). A mammary tumor is a tumor of the mammary tissue. [2] Breast blood supply comes from three sources: Branches of the axillary artery supply the lateral part of the breast. Dolphins do not possess gills, and instead must surface to breath air through blowholes on the tops of their heads or back. This normal variant can present as a mass anywhere along the course of the embryologic mammary streak (axilla to the inguinal region). (Preadolescent) only the tip of the nipple is raised.