mammary ridge


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mammary ridge

[′mam·ə·rē ‚rij]
(embryology)
An ectodermal thickening forming a longitudinal elevation on the chest between the limbs from which the mammary glands develop.
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The breast tissue continues to develop in the normal pectoral region of the milk line, with regression of the remainder of the mammary ridges. The failure of this regression leads to the formation of ectopic breast tissue that can act as normal breast tissue or cause benign and malignant tumors.
(1-6) This line represents the location of the embryonic mammary ridges which involutes except for the two segments located in the pectoral regions which develop into breasts.
In normal development, most of the embryological mammary ridges resolve, except for two segments in pectoral region, which later become breast.