The milk lines are two parallel lines, formed by thickenings of the epidermis along the ventral surface of mammals of both sexes. They extend from the upper limbs (arms) to the lower limbs (legs) and are developed in the embryo. They give rise to the mammary glands and nipples but are otherwise usually not visible in the adult. Cross-section of all skin layers Optical Coherence Tomography tomogram of fingertip, depicting stratum corneum (~500µm thick) with stratum disjunctum on top and stratum lucidum (connection to stratum spinosum) in the middle. ... In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... 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 milk producing sweat glands, and by the presence of: hair, three middle ear bones used in hearing, and a neocortex... For other uses, see Embryo (disambiguation). ... Mammary glands are the organs that, in the female mammal, produce milk for the sustenance of the young. ... This article is about the anatomical structure. ...
Milk lines in humans
In humans, milk lines appear in the seventh week of embryonic development. After initial development of the milk lines they go into remission. This article is about modern humans. ...
Nipples develop on the milk lines of mammals. Most of us have two nipples, but in some cases humans can develop more than two nipples. We have heard of 'third nipples', but there can be more than three nipples in very rare cases, all which would grow along the milk lines.
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