mammary crest

(redirected from milk ridge)

mam·ma·ry crest

(măm'ă-rē krest)
Bandlike thickening of ectoderm in the embryo extending on either side from just below the axilla to the inguinal region; in human embryos, the mammary glands arise from primordia in the thoracic part of the ridge.
Synonym(s): mammary fold, milk line, milk ridge.
References in periodicals archive ?
In humans, the milk ridge and the mammary bud along this milk line develop during the 6th week of intrauterine life.
Once the embryo starts to develop male characteristics, the milk ridges regress - leaving the nipples behind.