Human male torso with nipples

In its most general form, a nipple is an appurtenance from which a fluid emanates, in this instance breast milk, to nurture a mother's young. Nipple may refer to: The nipple, in human or mammalian anatomy. ... Image File history File links Download high resolution version (537x606, 28 KB) Summary Photo of a male torso. ... Image File history File links Download high resolution version (537x606, 28 KB) Summary Photo of a male torso. ... Appurtenances (from late Latin appertinentia, from appertinere, to appertain) is a legal term for what belongs to and goes with something else, the accessories or things usually conjoined with the substantive matter in question. ... It has been suggested that the section Benefits for the infant from the article Breastfeeding be merged into this article or section. ...

Anatomy

In the anatomy of mammals, a nipple or mammary papilla is a small projection of skin containing the outlets for 15-20 lactiferous ducts arranged cylindrically around the tip. The skin of the nipple is rich in a supply of special nerves that are sensitive to certain stimuli. The physiological purpose of nipples is to deliver milk to the infant, produced in the female mammary glands during lactation. In the male, nipples are often not considered functional with regard to breastfeeding, although male lactation is possible. Mammalian infants have a rooting instinct for seeking the nipple, and a sucking instinct for extracting milk. Human heart and lungs, from an older edition of Grays Anatomy. ... Subclasses & Infraclasses Subclass †Allotheria* Subclass Prototheria Subclass Theria Infraclass †Trituberculata Infraclass Metatheria Infraclass Eutheria Mammals (class Mammalia) are warm-blooded, vertebrate animals characterized by the presence of sweat glands, including those that produce milk, and by the presence of: hair, three middle ear bones used in hearing, and a neocortex... Beyond overall skin structure, refer below to: See-also. ... Lactiferous ducts are lobes of the mammary gland at the tip of the nipple. ... A glass of cows milk. ... Mammary glands are the organs that, in the female mammal, produce milk for the sustenance of the young. ... Kittens nursing Lactation describes the secretion of milk from the mammary glands, the process of providing that milk to the young, and the period of time that a mother lactates to feed her young. ... This article is about the Male sex. ... An infant breastfeeding International Breastfeeding Symbol (Matt Daigle, Mothering magazine contest winner 2006) Breastfeeding is the feeding of an infant or young child with milk from a womans breasts. ... This article or section does not adequately cite its references or sources. ... Suction is the creation of a partial vacuum, or region of low pressure. ...

Mammals typically have an even number of nipples arranged around bilaterally. In the primitive mammals (monotremes such as the platypus), the mammary glands empty onto the skin without a nipple. Families †Kollikodontidae Ornithorhynchidae Tachyglossidae †Steropodontidae Monotremes (monos, single + trema, hole; refers to the cloaca) are mammals that lay eggs instead of giving birth to live young like marsupials (Metatheria) and placental mammals (Eutheria). ... For other uses, see Platypus (disambiguation). ...

In human anatomy, the two nipples are located near the center of the breasts, surrounded by an area of sensitive, pigmented skin known as the areola. The pigments of the nipple and areola are brown eumelanin (a brown pigment) and to a greater extent pheomelanin (a red pigment). The nipple and areola of males and females can be erotic receptors, or considered sex organs. Stimulation or sexual arousal can cause the nipples to become erect, due to the release of the polypeptide neurotransmitter oxytocin. Breastfeeding or exposure to cold temperatures often has this effect as well. This article is about modern humans. ... For other uses, see Breast (disambiguation). ... Cross section of the breast of a human female. ... Melanin is a polymer of either or both of two monomer molecules: indolequinone, and dihydroxyindole carboxylic acid. ... Melanin is a polymer of either or both of two monomer molecules: indolequinone, and dihydroxyindole carboxylic acid. ... A sex organ, or primary sexual characteristic, narrowly defined, is any of those parts of the body (which are not always bodily organs according to the strict definition) which are involved in sexual reproduction and constitute the reproductive system in an complex organism; namely: Male: penis (notably the glans penis... Turn on redirects here. ... An erection of the penis occurs when two tubular structures that run the length of the penis, the corpora cavernosa, become engorged with venous blood. ... Peptides are the family of molecules formed from the linking, in a defined order, of various amino acids. ... Chemical structure of D-aspartic acid, a common amino acid neurotransmitter. ... Oxytocin (Greek: quick birth) is a mammalian hormone that also acts as a neurotransmitter in the brain. ... An infant breastfeeding International Breastfeeding Symbol (Matt Daigle, Mothering magazine contest winner 2006) Breastfeeding is the feeding of an infant or young child with milk from a womans breasts. ...

The average projection and size of human female nipples is slightly more than 3/8 inches (0.4 in./10mm.) ^[1]. Pregnancy and nursing tend to increase nipple size somewhat, and this increase may remain permanently thereafter. Pregnancy also increases the pigmentation of the nipples. The erection of the nipple is partially due to the cylindrically arranged muscle cells found within it. In many women there are small bulges on the areola, which are called 'Montgomery bodies'. Glands of Montgomery are sebaceous glands in the areola (of the nipple). ...

Embryologically, nipples develop along the 'milk lines' which in humans extend from the axilla (armpit) down to the pubis (groin) on both sides. Most mammals develop multiple nipples along each milk line, with the total number approximating the maximum litter size, and half the total number (i.e. the number on one side) approximating the average litter size for that species. Most people develop two nipples (one on each breast) but some have supernumerary nipples. Occasionally, these have lactiferous glands attached. This article or section is in need of attention from an expert on the subject. ... The milk lines are a thickening of the epidermis, from the upper limbs (arms) to the lower limbs (legs) in mammals of both sexes. ... The armpit (or axilla) is the area on the human body directly under the area where the arm connects to the shoulder. ... A man and a woman in the Pioneer plaque. ... A supernumerary nipple (also known as a third nipple, accessory nipple, polythelia or polymastia) is an additional nipple occurring in mammals, including humans. ...

Sometimes, babies (male or female) are born producing milk. This, called 'witch's milk', is caused by maternal estrogens acting on the baby and is quite normal. Witch's milk disappears after several days. The term baby can refer to: an infant a very early computer—the Small-Scale Experimental Machine, nicknamed Baby a musician – Brian Williams – who performs under the name Baby. ... Witchs milk or neonatal milk is milk secreted from the breasts of some newborn infants. ... Estriol. ...

Nipples on male mammals

Starting at conception and lasting until about 14 weeks, all mammalian fetuses within the same species look the same, regardless of gender. After 14 weeks, genetically-male fetuses begin producing male hormones such as testosterone. As "female" is the "developmental default" for mammals, by 14 weeks, the nipples have already formed. Testosterone is a steroid hormone from the androgen group. ...

Most of the time, males' nipples don't change much past this point. However, some males develop a condition known as gynecomastia, in which the fatty tissue around and under the nipple develops into something similar to a female breast. For males who develop gynecomastia during puberty, it is said the effects are temporary unless they are obese. This may happen whenever the testosterone level drops because of medications Gynecomastia, or gynaecomastia, pronounced is the development of abnormally large mammary glands in males resulting in breast enlargement, which can sometimes cause secretion of milk. ... Gynecomastia, or gynaecomastia, pronounced is the development of abnormally large mammary glands in males resulting in breast enlargement, which can sometimes cause secretion of milk. ... Obesity is an excess storage of fat and can affect any mammal, such as the mouse on the left. ... Testosterone is a steroid hormone from the androgen group. ...

See also

• List of sexology topics: Areola, Breast, Erection, Male lactation, Masters and Johnson, Masturbation, Milk fetishism, Nudity, Sex organ, Sexual arousal
• Biological development: Breastfeeding, Infant, Inverted nipple, Oxytocin, Prolactin, Supernumerary (third) nipple, Tit, Wet nurse, Witch's milk
• Modification methods: Nipple piercing, Body nullification, Jewellery
• Anatomy & Physiology: Mammary gland, Breast, Teat, Udder, Milk line, Lactation, Milk

This is a list of topics related to sexology, human sexuality and marriage customs, and related topics such as human sexual anatomy, reproductive biology, andrology, gynaecology, obstetrics and, where relevant, anthropology. ... Cross section of the breast of a human female. ... For other uses, see Breast (disambiguation). ... The erection of the penis, clitoris or a nipple is its enlarged and firm state. ... This article or section does not adequately cite its references or sources. ... Time magazine, May 25, 1970 The Masters and Johnson research team, made up of William Masters and Virginia E. Johnson, pioneered research into the nature of human sexual response and the diagnosis and treatment of sexual disorders and dysfunctions from 1957 until the 1990s. ... Woman masturbating, 1913 drawing by Gustav Klimt. ... This article or section does not cite its references or sources. ... “Nude” redirects here. ... Genitalia masculina externa A sex organ, or primary sexual characteristic, as narrowly defined, is any of those anatomical parts of the body which are involved in sexual reproduction and constitute the reproductive system in a complex organism; namely: Male: testicles, penis, prepuce, scrotum, prostate, seminal vesicles, epididymis, Cowpers glands... Turn on redirects here. ... An infant breastfeeding International Breastfeeding Symbol (Matt Daigle, Mothering magazine contest winner 2006) Breastfeeding is the feeding of an infant or young child with milk from a womans breasts. ... “Baby” redirects here. ... This article or section does not cite any references or sources. ... Oxytocin (Greek: quick birth) is a mammalian hormone that also acts as a neurotransmitter in the brain. ... Prolactin (PRL) is a peptide hormone primarily associated with lactation. ... A supernumerary nipple (also known as a third nipple, accessory nipple, polythelia or polymastia) is an additional nipple occurring in mammals, including humans. ... Look up tit in Wiktionary, the free dictionary. ... A wet nurse is a woman who nurses a baby not her own. ... Witchs milk or neonatal milk is milk secreted from the breasts of some newborn infants. ... A nipple with a barbell piercing Male nipple piercings Pierced nipples with hoops and connecting chain A nipple piercing is a piercing, centered usually at the base of the nipple. ... Body nullification is extreme body modification that involves the voluntary removal of body parts. ... For the Korean music group, see Jewelry (group). ... Human heart and lungs, from an older edition of Grays Anatomy. ... This article or section does not cite any references or sources. ... Mammary glands are the organs that, in the female mammal, produce milk for the sustenance of the young. ... For other uses, see Breast (disambiguation). ... A goat kid feeding on its mothers milk Teat is an alternative word for the nipple of a mammary gland, in humans referred to as a breast, from which milk is discharged. ... A cow udder with 4 teats An udder is the mammary organ of cattle and some other mammals, including goats and sheep. ... The milk lines are a thickening of the epidermis, from the upper limbs (arms) to the lower limbs (legs) in mammals of both sexes. ... Kittens nursing Lactation describes the secretion of milk from the mammary glands, the process of providing that milk to the young, and the period of time that a mother lactates to feed her young. ... A glass of cows milk. ...

References

1. ^ M. Hussain, L. Rynn, C. Riordan and P. J. Regan, Nipple-areola reconstruction: outcome assessment; European Journal of Plastic Surgery, Vol. 26, Num. 7, December, 2003

• Stephen Jay Gould, "Male Nipples and Clitoral Ripples", in Adam's Navel and Other Essays, London: Penguin, 1995.