Mammary ridge: Difference between revisions
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==Morphology of early mammary development== |
==Morphology of early mammary development== |
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Mammary gland development is initiated during [[embryo]]nic 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 [[Dorsum (biology)|dorsal]] midline. These buds are either located in the [[thoracic]] region in [[primate]]s, in the [[inguinal]] area in [[ungulate]]s or along the entire length of the trunk in [[rodent]]s and [[pig]]s. |
Mammary gland development is initiated during [[embryo]]nic 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 [[Dorsum (biology)|dorsal]] midline. These buds are either located in the [[thorax|thoracic]] region in [[primate]]s, in the [[abdomen|inguinal]] area in [[ungulate]]s or along the entire length of the trunk in [[rodent]]s and [[pig]]s.<ref name=Robinson> {{cite journal|last = Robinson |first = Gertraud W. |year = 2004 |title = Identification of signaling pathways in early mammary gland development by mouse genetics |journal = Breast Cancer Res. |volume = 6 |issue = 3 |pmc = 400673 |doi = 10.1186/bcr776 |accessdate = 7 July 2011}} </ref> |
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==Milk lines in humans== |
==Milk lines in humans== |
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Revision as of 09:32, 7 July 2011
The milk lines are two parallel lines, formed by thickenings of the epidermis (the mammary ridge) 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.
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 midline. These buds are either located in the thoracic region in primates, in the inguinal area in ungulates or along the entire length of the trunk in rodents and pigs.[1]
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.
Nipples develop on the milk lines of mammals. Most humans have two nipples, but in some cases more than two will develop. In most cases, these "third nipples"—and sometimes fourth nipple—grow along the milk line.
See also
References
- ^ Robinson, Gertraud W. (2004). "Identification of signaling pathways in early mammary gland development by mouse genetics". Breast Cancer Res. 6 (3). doi:10.1186/bcr776. PMC 400673.
{{cite journal}}:|access-date=requires|url=(help)CS1 maint: unflagged free DOI (link)
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