mammary crest


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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.