Dictionary of Human Evolution and Biology

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Mammary Gland

Modified sebaceous or sweat gland that produces milk in female mammals; in most mammals the mammary glands are found on the ventral surface and vary in the number of pairs. Among anthropoids only a single pectoral pair is present; there are often one or more additional abdominal pairs in prosimians. Mammary glands are unique to mammals and give the name to the class Mammalia. Aka breast.

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From "Dictionary of Nursing and Individual Health Care"