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perineum 11.10
muscles of the perineum
muscle | origin | insertion | action | intervation |
---|---|---|---|---|
superficial transverse perineal | ishial tuberosity | perineal body of perineum | stabilizes perineal body of perineum | perineal branch of the pedendal nerve of the sacral plexus |
bulbospongiosus | perineal body of perineum | perineal membrane of deep muscles of perineum, corpus spongiosum of penis and deep fascia on dorsum of penis in male. pubic arch and root and dorsum of clitoris in female | helps expel urine during urination, helps propel semen along uretha, assists in erection of the penis ,constricts vaginal orifice and assists in erection of the clitoris | perineal branch of the pudendal nerve of the sacral plexus |
ishiocavernosus | ischial tuberosity and ischial and pubic rami | corpus cavernosum of penis and clitoris | maintains erestion of penis and clitoris | perineal branch of the pudendal nerve of the sacral plexus |
deep transverse perineal | ischial rami | perineal body of the perineum | helps expel last drops of urine and semen in male and urine in female | perineal branch of the pudendal nerve of the sacral plexus |
external urethral sphincter | ischial and pubic rami | median raphe in male and vaginal wall in female | helps expel last drops of urine and semen in male and urine in female | sacral spinal nerve s4 and the inferior rectal branch of the pudendal nerve |
external anal sphincter | anococcygeal ligament | perineal body of perineum | keeps anal canal and anus closed | sacral spinal nerve s4 and the inferior rectal branch of the pudendal nerve |