mammary crest


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.