PERINAEUM
\pˈɛɹɪnˌiːəm], \pˈɛɹɪnˌiːəm], \p_ˈɛ_ɹ_ɪ_n_ˌiː__ə_m]\
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A surface of the body limited by the scrotum in front, the buttocks behind, and laterally by the medial side of the thigh.
By Henderson, I. F.; Henderson, W. D.
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The space at the inferior region of the trunk, between the ischiatic tuberosities, anus, and genital organs. It is smaller in the female than in the male; has a triangular shape, and is divided into two equal parts by a median line, called Raphe. It is occasionally ruptured in labour. At times, it has been made to extend posteriorly as far as the os coccygis. The part between the pudendum and anus is sometimes called anterior perinaeum, to distinguish it from that which extends from the anus to the coccyx, called pasterior perinaeum.
By Robley Dunglison