Mm. of the perineum

Question 1

bulbospongiosus actions

Answer 1

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

Question 2

bulbospongiosus innervation

Answer 2

perineal branch of the pudendal nerve

Question 3

ischiocavernosus actions

Answer 3

compresses crus during erection

Question 4

ischiocavernosus innervation

Answer 4

perineal beranch of the pudendal nerve

Question 5

external anal sphincter innervation

Answer 5

inferior rectal branch of the pudendal nerve

Question 6

external anal sphincter actions

Answer 6

closes anal canal and fixes perineal body

Question 7

external urethral sphincter attachments

Answer 7

• surrounds urethra

Question 8

external urethral sphincter actions

Answer 8

compresses urethra

Question 9

external urethral sphincter innervation

Answer 9

perineal branch of the pudendal nerve

Question 10

Superficial transverse perineal muscle attachments

Answer 10

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

Question 11

Superficial transverse perineal muscle actions

Answer 11

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

Question 12

Superficial transverse perineal muscle innervation

Answer 12

perineal branch of the pudendal nerve

Question 13

Deep transverse perineal muscle attachments

Answer 13

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

Question 14

Deep transverse perineal muscle actions

Answer 14

• support perineal body, support pelvic viscera, resist increased intraabdominal pressure

Question 15

Deep transverse perineal muscle innervation

Answer 15

perineal branch of the pudendal nerve

Question 16

What covers the perineum (fascia)?

Answer 16

superficial perineal fascia (Colles’)

Question 17

Why is “bulb” in the name of bulbospongiosus?

Answer 17

Because it runs along the bulb of the vestibule (females) or bulb of penis (males)