. Cunningham's Text-book of anatomy. Anatomy. 740 THE NERVOUS SYSTEM. Coursing forwards through the anterior part of the ischio-rectal fossa, it passes between the two layers of fascia of the urogenital diaphragm towards the urethra. It supplies muscular branches to the anterior parts of the levator ani and external sphincter, to the transversus perinei, superficialis and profundus, ischio-cavernosus, bulbo-cavernosus (or sphincter vaginas), and sphincter urethras membranaceas. It terminates as the nerve to the bulb, which, piercing the urogenital diaphragm, enters the bulb of the urethra and
. Cunningham's Text-book of anatomy. Anatomy. 740 THE NERVOUS SYSTEM. Coursing forwards through the anterior part of the ischio-rectal fossa, it passes between the two layers of fascia of the urogenital diaphragm towards the urethra. It supplies muscular branches to the anterior parts of the levator ani and external sphincter, to the transversus perinei, superficialis and profundus, ischio-cavernosus, bulbo-cavernosus (or sphincter vaginas), and sphincter urethras membranaceas. It terminates as the nerve to the bulb, which, piercing the urogenital diaphragm, enters the bulb of the urethra and supplies the erectile tissue of the bulb and corpus cavernosum urethras, as well as the mucous membrane of the urethra as far as the glans penis (or clitoridis). N. Dorsalis Penis vel Clitoridis.—The dorsal nerve of the penis or clitoris, the other terminal branch of the pudendal nerve accompanies the internal pudendal artery beneath the fascia inferior of the urogenital diaphragm. It passes forward close to the pubic arch, lying beneath the crus and ischio-cavernosus, and fascia inferior of the urogenital diaphragm, and upon the sphincter urethras mem- branaceas muscle; piercing the fascia inferior of the urogenital diaphragm near Nerve to obturator internus \—. Lumbo-sacral trunk The anterior rami -of the first four sacral nerves Pudendal nerve Perineal branch of the fourth sacral nerve .Inferior liBmorrhoidal Perineal branch M"of pudendal nerve Deep perineal nerve Superficial perineal nerve Fig. 633.—The Origin and Course of the Pudendal Nerve. its apex, at the lateral side of the dorsal artery of the penis (or clitoris), it passes on to the dorsum of the penis or clitoris, to which it is distributed in its distal two-thirds, sending branches round the sides of the organ to reach its under surface. In the female the nerve is much smaller than in the male. The dorsal nerve of the penis supplies one branch, the nerve to the corpus cavernosum penis, as it lies beneat
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