File:Cunningham's Text-book of anatomy (1914) (20628298270).jpg

Title: Cunningham's Text-book of anatomy
Identifier: cunninghamstextb00cunn (find matches)
Year: 1914 (1910s)
Authors: Cunningham, D. J. (Daniel John), 1850-1909; Robinson, Arthur, b. 1862, ed
Subjects: Anatomy
Publisher: New York, W. Wood
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Text Appearing Before Image:
488 THE MUSCULAR SYSTEM. Nerve-Supply.—Deep branch of the perineal nerve (pudendal, S. 3. 4.). Actions.—In the male.—The bulbocavernosus contracts the urethra in the emission of urine and semen, and is an accessory muscle in erection of the penis. In the Female.—The muscle contracts the vaginal orifice, and compresses the bulb of the vestibule of the vagina. M. Ischiocavernosus.—The ischiocavernosus (O.T. erector penis), in the male, covers the crus penis. It arises from the ischial tuberosity and the sacro- tuberous ligament. Passing forwards, it is inserted by a fascial attachment into the inferior surface of the crus penis, and into the lateral and dorsal aspects of the corpus caver - nosum penis. The ischiocavernosus (O.T. erector clitoridis), in the female, has a similar dis- position, but is of much smaller size than in the male. The pubocavemosus is an occasional slip arising from the pubic ramus, and inserted into the dorsum of the penis. It corresponds to the levator penis of lower animals. Nerve-Supply.—Deej) branch of the perineal nerve (pudendal, S. 3. 4.). Action.—The muscle assists in erection of the penis (or clitoris). Corpus cavemosum penis (cut) Nerve to corpus cavernosum penis Nerve to dorsum of penis Sphincter urethrse MElIBRA2fACEiE Nerve to bulb Fascia superior of uro- genital tirophragm Pudendal nerve Bulb of penis Fascia inferior of urogenital diaphragm
Text Appearing After Image:
Fig. 433.—The Fascle of the Urogenital Diaphragm of the Perineum, and the Termination of the Pudendal Nerve. Diaphragma Urogenitale.—The sphincter urethras membranaceas and the transversus perinei profundus constitute the deeper muscular stratum of the perineum and form the urogenital diaphragm. They lie between two layers of fascia called the fascia inferior, and fascia superior of the urogenital diaphragm (O.T. superficial and deep layers of the triangular ligament). M. Sphincter Urethrse Membranacese.—The sphincter of the membranous urethras (O.T. compressor urethras) arises from the inferior part of the pubic ramus, and is directed medially, its fibres radiating so as to enclose the membranous urethra. It is inserted into a median raphe, partly anterior to the urethra, but for the most part posterior to it. The fibres most intimately related to the urethra form a muscular sheath for the canal, and have no bony attachments. M. Transversus Perinei Profundus.—The transversus perinei profundus consists of a bundle of fibres on each side, arising from the inferior ramus of the ischium just below the sphincter urethras membranacese. It is inserted into a median raphe continuous with that of the sphincter urethras membranacese. The muscle, in fact, constitutes a separate bundle below and behind the sphincter. The ischiopubicus is a term applied to a feeble bundle of fibres which, when present, lies above and in front of the sphincter urethras membranaceEe. It arises from

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