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Milk line
 
 
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The milk lines are two parallel lines, formed by thickenings of the epidermis
Epidermis (skin)

The epidermis is the outermost layer of the skin, composed of terminally differentiated stratified squamous epithelium, acting as the body's major barrier against an inhospitable environment....
 (the mammary ridge) along the ventral surface of mammal
Mammal

Mammals are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young....
s of both sexes. They extend from the upper limbs (arms) to the lower limbs (legs) and are developed in the embryo
Embryo

An embryo is a multicellular organism ploidy eukaryote in its earliest stage of development, from the time of first cell division until birth, Egg , or germination....
. They give rise to the mammary gland
Mammary gland

Mammary glands are the organ s that, in mammals, produce milk for the sustenance of the young. These exocrine glands are enlarged and modified sweat glands and give mammals their name....
s and nipple
Nipple

In its most general form, a nipple is a structure from which a fluid emanates. More specifically, it is the projection on the breasts of a mammal by which breast milk is delivered to a mother's young....
s but are otherwise usually not visible in the adult.

ary gland development is initiated during embryonic life.






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The milk lines are two parallel lines, formed by thickenings of the epidermis
Epidermis (skin)

The epidermis is the outermost layer of the skin, composed of terminally differentiated stratified squamous epithelium, acting as the body's major barrier against an inhospitable environment....
 (the mammary ridge) along the ventral surface of mammal
Mammal

Mammals are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young....
s of both sexes. They extend from the upper limbs (arms) to the lower limbs (legs) and are developed in the embryo
Embryo

An embryo is a multicellular organism ploidy eukaryote in its earliest stage of development, from the time of first cell division until birth, Egg , or germination....
. They give rise to the mammary gland
Mammary gland

Mammary glands are the organ s that, in mammals, produce milk for the sustenance of the young. These exocrine glands are enlarged and modified sweat glands and give mammals their name....
s and nipple
Nipple

In its most general form, a nipple is a structure from which a fluid emanates. More specifically, it is the projection on the breasts of a mammal by which breast milk is delivered to a mother's young....
s but are otherwise usually not visible in the adult.

Morphology of early mammary development

Mammary gland development is initiated during embryonic life. The first manifestation of the gland in many mammals is an elevated ridge or milk line, which then fragments into individual buds in specific regions lateral of the dorsal
Dorsal

Dorsal is an adjective which means being at the back.Dorsal may refer to:* Dorsum , a part of an animal* A dorsal consonant, in linguistics...
 midline. These buds are either located in the thoracic region in primate
Primate

A primate is a member of the biological order Primates , the group that contains lemurs, the Aye-aye, Lorisidaes, galagos, tarsiers, monkeys, and apes, with the last category including humans....
s, in the inguinal area in ungulate
Ungulate

Ungulates are several groups of mammals, most of which use the tips of their toes, usually hoofed, to sustain their whole body weight while moving....
s or along the entire length of the trunk in rodent
Rodent

Rodentia is an Order of mammals also known as rodents, characterised by two continuously growing Incisors#The_Rodent_incisor in the upper and lower jaws which must be kept short by gnawing....
s and pig
Pig

Pigs, also called hogs or swine, are a genus of even-toed ungulates within the Family Suidae. The name pig, hog, or swine most commonly refers to the Domestic pig in everyday parlance, but technically encompasses several distinct species, including the Wild Boar....
s.

Milk lines in humans

In human
Human

A human being, also human or man, is a member of a species of bipedalism primates in the family Hominidae . Mitochondrial DNA evidence indicates that modern humans originated in east Africa about 200,000 years ago....
s, milk lines appear in the seventh week of embryonic development. After initial development of the milk lines they go into remission.

Nipples develop on the milk lines of mammals. Most humans have two nipples, but in some cases more than two will develop. These rare "third nipples" - and, even more rarely, fourth nipples - all grow along the milk line.

See also

  • Supernumerary nipple
    Supernumerary nipple

    A supernumerary nipple is an supernumerary body part nipple occurring in mammals, including humans. Often mistaken for mole , supernumerary nipples are diagnosed at a rate of 1 in 18 humans....
  • Mammary gland
    Mammary gland

    Mammary glands are the organ s that, in mammals, produce milk for the sustenance of the young. These exocrine glands are enlarged and modified sweat glands and give mammals their name....
  • Breast
    Breast

    The breast is the upper ventral region of an animal?s torso, particularly that of mammals, including human beings. The breasts of a female primate?s body contain the mammary glands, which secrete milk used to feed infants....
  • Nipple
    Nipple

    In its most general form, a nipple is a structure from which a fluid emanates. More specifically, it is the projection on the breasts of a mammal by which breast milk is delivered to a mother's young....
  • Teat
    Teat

    Teat is an alternative word for the nipple of a mammary gland, in humans referred to as a breast, from which milk is discharged. Similarly, in Cattles, goats, etc., teats are the projections from the udder through which milk is discharged....
  • Udder
    Udder

    An udder is the mammary gland organ of female cattle and some other mammals, including goats and sheep. Udder care and hygiene in cows is important in milking, aiding uninterrupted and untainted milk production, and preventing mastitis....
  • Lactation
    Lactation

    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....
  • Milk
    Milk

    Milk is an opaque white liquid produced by the mammary glands of female mammals . It provides the primary source of nutrition for newborn mammals before they are able to digestion other types of food....