Muscles Of Pelvic Floor And Perineum

Question 0

Insertion of Levator ani

Answer 0

Inner surface of coccyx, Levator ani of opposite side, and (in part) into the structures that penetrate it

Question 1

Origin of Levator ani

Answer 1

Extensive linear origin inside pelvis from pubis to ischial spine

Question 2

Action of Levator ani

Answer 2

Supports and maintains position of pelvic organs; resists downward thrusts that accompany rises in intrapelvic pressure during coughing, vomiting, and expulsive efforts of abdominal muscles; forms sphincters at anorectal junction and vagina; lifts anal canal during defecation

Question 3

Innervation of Levator ani

Answer 3

S3, s4, and inferior rectal nerve (branch of pudendal nerve)

Question 4

Origin of coccygeus

Answer 4

Spine of ischium

Question 5

Insertion of coccygeus

Answer 5

Sacrum and coccyx

Question 6

Action of coccygeus

Answer 6

Supports pelvic organs; supports coccyx and pulls it forward after it has been reflected posteriorly by defecation and childbirth

Question 7

Innervation of coccygeus

Answer 7

S4 and s5

Question 8

Origin of deep transverse perineal muscle

Answer 8

Ischial rami

Question 9

Insertion of deep transverse perineal muscle

Answer 9

Midline central tendon of perineum; some fibers into vaginal wall in females

Question 10

Action of deep transverse perineal muscle

Answer 10

Supports pelvic organs

Question 11

Innervation of deep transverse perineal muscle

Answer 11

Pudendal nerve

Question 12

Origin of external urethral sphincter

Answer 12

Ischiopubic rami

Question 13

Insertion of external urethral sphincter

Answer 13

Midline raphe

Question 14

Action of external urethral sphincter

Answer 14

Constricts urethra

Question 15

Innervation of external urethral sphincter

Answer 15

Pudendal nerve

Question 16

Origin of ischiocavernosus

Answer 16

Ischial tuberosities

Question 17

Insertion of ischiocavernosus

Answer 17

Crus of corpus cavernosa of penis or clitoris

Question 18

Action of ischiocavernosus

Answer 18

Retards venous drainage and maintains erection of penis or clitoris

Question 19

Innervation of ischiocavernosus

Answer 19

Pudendal nerve

Question 20

Origin of bulbospongiosus

Answer 20

Central tendon of perineum and midline raphe of penis

Question 21

Insertion of bulbospongiosus

Answer 21

Anteriorly into corpus cavernosa of penis or clitoris

Question 22

Action of bulbospongiosus

Answer 22

Empties male urethra

Question 23

Innervation of bulbospongiosus

Answer 23

Pudendal nerve

Question 24

Origin of superficial transverse perineal muscle

Answer 24

Ischial tuberosity

Question 25

Insertion of superficial transverse perineal muscle

Answer 25

Central tendon of perineum

Question 26

Action of superficial transverse perineal muscle

Answer 26

Stabilizes and strengthens central tendon of perineum

Question 27

Innervation of superficial transverse perineal muscle

Answer 27

Pudendal nerve