Muscles of the Perineum

Question 1

Bulbospongiosus

Answer 1

actions- in male empties urethra, maintains erection & contracts during ejaculation; in female constricts vaginal orifice & contributes to erection of clitoris

innervation- perineal branch of the pudendal nerve

Question 2

Ischiocavernosus

Answer 2

actions- compresses crus during erection

innervation- perineal branch of the pudendal nerve

Question 3

External anal sphincter

Answer 3

actions- closes anal canal & fixes perineal body

innervation- inferior rectal branch of the pudendal nerve

Question 4

External urethral sphincter

Answer 4

attachments- surrounds urethra

actions- compresses urethra

innervation- perineal branch of the pudendal nerve

Question 5

Superficial transverse perineal

Answer 5

attachments- from inferior ramus of ischium and ischial tuberosity to inferior aspect of posterior border of perineal membrane to perineal body

actions- support perineal body, support pelvic viscera, resist increased intraabdominal pressure

innervation- perineal branch of the pudendal nerve

Question 6

Deep transverse perineal

Answer 6

attachments- from inferior ramus of ischium and ischial tuberosity to superior aspect of posterior border of perineal membrane to perineal body and external analy sphincter

actions- support perineal body, support pelvic viscera, resist increased intraabdominal pressure

innervation- perineal branch of the pudendal nerve