. Cunningham's Text-book of anatomy. Anatomy. 486 THE MUSCULAR SYSTEM. THE MUSCLES OF THE PERINEUM. The perineal muscles are naturally separated into a superficial and a deep set by the fascia inferior of the urogenital diaphragm. Superficial to it are the sphincter ani externus, transversus perinei superficialis, bulbocavernosus, and ischiocavernosus; deep to it are the sphincter muscle of the membranous urethra and the transversus perinei profundus. M. Sphincter Ani Externus.âThis muscle is fusiform in outline, flattened, and obliquely placed around the anus and anal canal. It can be separat
. Cunningham's Text-book of anatomy. Anatomy. 486 THE MUSCULAR SYSTEM. THE MUSCLES OF THE PERINEUM. The perineal muscles are naturally separated into a superficial and a deep set by the fascia inferior of the urogenital diaphragm. Superficial to it are the sphincter ani externus, transversus perinei superficialis, bulbocavernosus, and ischiocavernosus; deep to it are the sphincter muscle of the membranous urethra and the transversus perinei profundus. M. Sphincter Ani Externus.âThis muscle is fusiform in outline, flattened, and obliquely placed around the anus and anal canal. It can be separated into three layers,âsubcutaneous, superficial, and deep. (1) The most superficial lamina Posterior scrotal / nerves I. Perineal branch of posterior cutaneous nerve of thigh Superficial branch of perineal nerve Deep transverse perineal nerve Nervus perinei Inferior hemorrhoidal branches. - Dorsal nerve of penis â Nerve to corpus cavernosum penis V\ Nerve to corpus \9l ~ ' cavernosum urethra 0 f. , ) branche -Superficial ' ââ â ;â, \âDeep ' Perineal nerve jrf--Pudendal nerve of perineal j nerve 2HR-- Inferior hemorrhoidal if" branches --Pudendal nerve Fig. 431.âThe Muscles and Nerves of the Male Peulneuji. consists of subcutaneous fibres decussating posterior and anterior to the anus, but without bony attachments. (2) The sphincter ani superficialis constitutes the main portion of the muscle. It is attached posteriorly to the coccyx, and, anterior to the anus, it reaches the central point of the perineum. (3) The deep fibres of the muscle form for the most part a complete sphincter for the anal canal. They are continuous with the fibres of the levator ani; they encircle the anal canal, and blend anteriorly with the central point of the perineum and the transversus perinei superficialis muscle. M. Corrugator Cutis Ani.âThe corrugator cutis ani consists of bundles of unstriped muscular fibres which radiate from the margin of the anal opening superficial to the exte
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