RESIDUAL LACTATION ACINI IN THE FEMALE BREAST

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Abstract
THE EVOLUTION AND INVOLUTION OF THE HUMAN BREAST In the embryo of the lower animal, and in the human embryo of 8 mm., or less, a delicate line extends from the axillary to the inguinal region, along the junction of the abdominal wall and the membrana reuniens. It is known as the milk line, and consists of an epidermal thickening which later breaks up into ten or twelve nodal points, the rudiments of the future mammary glands. In different animals a varying number of these glands persist and undergo further development, while the remainder disappear, so that, with the completion of development, each animal is provided with the number of mammary glands normal to its kind, and in positions in conformity to its type. H. Schmidt has shown that human embryos are provided with a somewhat variable number of these rudiments, although normally only two survive, situated on the thorax

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