Insertion into the distal half of the lateral surface of the corpus cavernosum penis.
M. compressor urethræ membranaceæ (n).—A thick layer of striated muscle-fibres which surrounds the urethra between Cowper’s gland (3) and the prostate (4). The fibres have a circular course, and the cranial ones are attached to the crura of the penis. The other fibres have no fixed attachment.
c. Muscles Peculiar to the Female
([Fig. 114]).—M. levator vulvæ (Strauss-Durckheim), or constrictor cunni (b).—This is homologous with the levator scroti of the male. It consists of a band of fibres which pass ventrad from the external sphincter ani (a) and surround the vulva (3), lying immediately beneath the integument.
M. constrictor vestibuli, or rectovaginalis (Strauss-Durckheim) (d).
[Fig. 114].—Muscles of the Anus and Urogenital Organs in the Female.
![[Fig. 114]](#3418956513767812439_illo272lg.jpg.id-6374332924630272704.wrap-0.html.html){kind=link}
a, M. sphincter ani externus; b, M. levator vulvæ; c, M. sphincter ani internus; d, M. constrictor vestibuli; e, M. ischiocavernosus (cut); f, M. urethralis; g, M. caudoanalis; h, M. caudovaginalis; i, M. transversus perinei; j, M. caudorectalis. 1, the tail; 2, anus; 3, vulva; 4, rectum; 5, vagina; 6, neck of the bladder.
Origin from the sides of the sphincter ani internus (c). The muscle forms a distinct bundle two or three millimeters wide, which passes ventrocaudad and is inserted into the ventral surface of the urogenital sinus, caudad of the insertion of the ischiocavernosus (e).
M. caudovaginalis (Strauss-Durckheim) (h).—A slender band just craniad of the caudoanalis (g), and corresponding to the caudocavernosus of the male.