Unit 5 - Lower Limb: Muscles of the Perineum (Ex. IV)

Question 1

superficial transverse perineal

Answer 1

O: ischial ramus
I: perineal body
Inn: pudendal n. (S2-S4)
A: holds pelvic organs in place; closes urethra

Question 2

external anal sphincter

Answer 2

O: perineal body
I: anococcygeal ligament
*encircles anus and runs P from perineal body to anococcygeal ligament*
Inn: pudendal n. (S2-S4)
A: closes anus

Question 3

external urethral sphincter

Answer 3

O/I: encircles urethra (division of deep transverse perineal
Inn: pudendal n. (S2-S4)
A: closes urethra

Question 4

bulbospongiosus

Answer 4

O: perineal body
I: clitoris (females) or penile raphe (males)
runs A from perineal body to clitoris or penile raphe
Inn: pudendal n. (S2-S4)
A: females - compresses greater vestibular gland; males - assists in erection

Question 5

ischiocavernosus

Answer 5

O: ischial ramus
I: crus of clitoris or penis
Inn: pudendal n. (S2-S4)
A: maintains erection by squeezing blood into corpus cavernosum of clitoris or penis

Question 6

deep transverse perineal

Answer 6

O: I pubic ramus; ischial ramus
I: wall of vagina or prostate; perineal body
Inn: pudendal n. (S2-S4)
A: holds pelvic organs in place