Muscles of Perineum

Question 1

Insertion of Ischiocavernosus

Answer 1

Crus of clitoris or penis

Question 2

Innervation of Ischiocavernosus

Answer 2

Pudendal n. (S2-S4)

Question 3

Action of Ischiocavernosus

Answer 3

Maintains erection by squeezing blood into corpus cavernosum of clitoris or penis

Question 4

Origin and insertion of Bulbospongiosus

Answer 4

Runs anteriorly from perineal body to clitoris (females) or penile raphe (males)

Question 5

Innervation of Bulbospongiosus

Answer 5

Pudendal n. (S2-S4)

Question 6

Action of Bulbospongiosus

Answer 6

Females: Compresses greater vestibular gland
Males: Assists in erection

Question 7

Origin of Superficial transverse perineal

Answer 7

Ishial ramus

Question 8

Insertion of Superficial Transverse Perineal

Answer 8

Perineal Body

Question 9

Innervation of Superficial Transverse Perineal

Answer 9

Pudendal n. (S2-S4)

Question 10

Action of Superficial Transverse Perineal

Answer 10

Holds the pelvic organs in place, closes the urethra

Question 11

Origin of Deep transverse perineal

Answer 11

inferior pubic ramus; ischial ramus

Question 12

Insertion of the Deep transverse perineal

Answer 12

Wall of vagina or prostate, perineal body

Question 13

Innervation of Deep transverse perineal

Answer 13

Pudendal n. (S2-S4)

Question 14

Action of Deep transverse perineal

Answer 14

acts with pelvic floor muscles

Question 15

Origin and Insertion of External anal sphincter

Answer 15

Encircles anus (runs posteriorly from perineal body to abococcygeal ligament)

Question 16

Innervation of External anal sphincter

Answer 16

Pudendal n. (S2-S4)

Question 17

Action of external anal sphincter

Answer 17

closes anus

Question 18

Origin of Ischiocavernosus

Answer 18

Ischial ramus