Muscles of Pelvis/Perineum

Question 1

Sphincter urethrae shares the same supply and innervation as ischiocavernosus and bulbospongiosus: _____ a. and _____ n.

Answer 1

internal pudendal, perineal branch of pudendal

Question 2

The internal pudendal artery supplies all of the muscles in the perineum. What are those muscles? (8)

Answer 2

bulbospongiosus, ischiocavernosus, sphincter ani externus, sphincter urethrae, compressor urethrae, sphincter urethrovaginalis, deep transverse perineus, superficial transverse perineus

Question 3

Levator ani is innervated by branches of the _____ nerve, as well as ____ ventral rami.

Answer 3

pudendal, S4

Question 4

The _____ nerve, which is a branch of the pudendal nerve, innervates the sphincter ani externus.

Answer 4

inferior rectal

Question 5

The ischiocavernosus is innervated by the _____ nerve and supplied by the ______ artery. (hint: same as bulbospongiosus)

Answer 5

perineal branch of pudendal, internal pudendal

Question 6

The coccygeus is supplied by the following branches of the internal iliac: ______, ______, and ______.

Answer 6

inferior gluteal, internal pudendal, inferior rectal

Question 7

Sphincter ani externus attaches at the _____ tendon and _____ raphe. It _____ the anal canal and ____ the perineal body (action)

Answer 7

central, anococcygeal, closes, fixes

Question 8

Compressor urethrae attaches at the _____ ramus

Answer 8

ischiopubic

Question 9

The transverse perineus muscles _____ the perineum (action).

Answer 9

fix

Question 10

Every perineal muscle except ______ is innervated by the perineal branch of the pudendal nerve.

Answer 10

sphincter ani externus

Question 11

The coccygeus is innervated by ventral rami ______

Answer 11

S4-S5

Question 12

What muscle is responsible for erection in both males and females?

Answer 12

Bulbospongiosus

Question 13

Where does sphincter urethrae attach (pretty intuitive)?

Answer 13

surrounds the urethra

Question 14

sphincter urethrovaginalis attaches at the ______ body, then surrounds the _____ and _____

Answer 14

perineal, vagina, urethra

Question 15

The levator ani muscle supports the pelvic ______ and ______ the rectum and vagina.

Answer 15

viscera, compresses

Question 16

Both the deep and superficial transverse perineus attach at the ______ tuberosity and the ______ tendon.

Answer 16

ischial, central

Question 17

Blood supply for levator ani is the same as the other muscle in the pelvic diaphragm, plus one more. Name all 4 (all are branches of the internal iliac):

Answer 17

inferior gluteal, internal pudendal, inferior rectal, inferior vesical arteries.

Question 18

The coccygeus muscle attaches at the _____ spine and _____ ligament, and the ____

Answer 18

ischial, sacrospinous, coccyx

Question 19

What does sphincter urethrovaginalis compress?

Answer 19

urethra and vagina

Question 20

The female bulbospongiosus is responsible for constricting the ______.

Answer 20

vaginal orifice

Question 21

Where does bulbospongiosus attach in the female? (homologous structures to the male ones)

Answer 21

perineal body to the vestibular bulb, vaginal orifice, and clitoris

Question 22

What are the two muscles that make up the pelvic diaphragm?

Answer 22

Levator ani and coccygeus

Question 23

What is the blood supply for sphincter ani externus?

Answer 23

internal pudendal artery

Question 24

Both sphincter urethrae and compressor urethrae ______ the urethra (action).

Answer 24

compress

Question 25

The bulbospongiosus is innervated by the perineal branch of the ______ nerve and supplied by the _____ artery.

Answer 25

pudendal, internal pudendal

Question 26

Compressor urethrae passes _____ to the urethra, and ____ to the sphincter urethrae.

Answer 26

ventral, inferior

Question 27

ischiocavernosus compresses the _____ during erection.

Answer 27

crus

Question 28

The ischiocavernosus muscle attaches at the ischial ____ and ischial _____, and the aponeurosis surrounding the crus of the ______/______.

Answer 28

tuberosity, ramus, penis/clitoris

Question 29

Levator ani attaches at the pubic ______, ______ spine, midline raphe, and ________ ligament.

Answer 29

symphysis, ischial, anococcygeal

Question 30

Where does the bulbospongiosus muscle attach in the male?

Answer 30

median raphe and perineal body to the bulb of the penis

Question 31

In males, the bulbospongiosus also drains the _____ and contracts during ______.

Answer 31

urethra, ejaculation

Question 32

Compressor urethrae, sphincter urethrae, ischiocavernosus, bulbospongiosus are all innervated by the _____ branch of the _____ nerve

Answer 32

perineal, pudendal

Question 33

The _____ muscle compresses and supports the posterior pelvic floor.

Answer 33

coccygeus