Pelvis & Hemipelvectomy

Question 1

External Anal Sphincter Origin

Answer 1

skin & fascia surrounding anus; coccyx via anococcygeal ligamen

Question 2

External Anal Sphincter Insertion

Answer 2

perineal body

Question 3

External Anal Sphincter Innervation

Answer 3

Inferior anal (rectal) nerve, a branch of pudenal nerve (S2-S4)

Question 4

External Anal Sphincter Action

Answer 4

Constricts anal canal during peristalsis, resisting defecation; supports and fixed perineal body and pelvic floor

Question 5

Obturator Internus Origin

Answer 5

Pelvic surfaces of ilium and ishium; obturator membrane

Question 6

Obturator Internus Insetion

Answer 6

Greater Trochanter of femur

Question 7

Obturator Internus Acton

Answer 7

Rotates thigh laterally; assists in holding head of femur in acetabulum

Question 8

Obturator Internus Innervation

Answer 8

Nerve to Obturator Internus (L5, S1, S2)

Question 9

Ischiococcygeus Origin

Answer 9

Ischial Spine

Question 10

Ischiococcygeus Insertion

Answer 10

Inferior end of sacrum and coccyx

Question 11

Ischiococcygeus Innervation

Answer 11

Branches of S4 and S5 spinal nerves

Question 12

Ischiococcygeus Action

Answer 12

Forms small part of pelvic diaphragm that supports pelvic viscera; flexes coccyx

Question 13

Puborectalis Origin

Answer 13

right and left of pubic bodies

Question 14

Puborectalis Insertion

Answer 14

anal rectal junction

Question 15

Levator ani innervation ( puborectalis, pubococcygeus, and iliococcygeus)

Answer 15

S4 branches and inferior anal (rectal) nerve

Question 16

Pubococcygeus Origin

Answer 16

posterior aspect of the body of the pubis

Question 17

Pubococcygeus Insetion

Answer 17

anterior part of the tendinous arch to the coccyx

Question 18

Levator Ani action

Answer 18

forms most of the pelvic diaphagm that helps support pelvic viscera and resists increase in intra-abdominal pressure

Question 19

Iliococcygeus Origin

Answer 19

posterior part of the tendinous arch and ischial spine

Question 20

Iliococcygeus Insertion

Answer 20

anococcygeal ligament and tip of the coccyx

Question 21

Superficial Transverse perineal Origin

Answer 21

Internal surface of ischiopubic ramus and ischial tuberosity

Question 22

Superficial Transverse Perineal Insertion

Answer 22

Perineal Body

Question 23

Superficial Transverse Perineal Innervation

Answer 23

Muscular (deep) branch of perineal nerve, a branch of pudendal nerve (S2-S4)

Question 24

Superficial Transverse Perineal Action

Answer 24

supports and fixes perineal body/pelvic floor to support abdominopelvic viscera and resist increases intra-abdominal pressure

Question 25

Deep Transverse Perineal Origin

Answer 25

Internal Surface of ischiopubic ramus and ischial tuberosity

Question 26

Deep transverse Perineal Insertion

Answer 26

Perineal body and external anal sphincter

Question 27

Deep transverse perineal innervation

Answer 27

Muscular (deep) branch of perineal nerve, a branch of pudendal nerve (S2-S4)

Question 28

Deep transverse Perineal Action

Answer 28

supports and fixes perineal body/pelvic floor to support abdominopelvic viscera and resist increases intra-abdominal pressure

Question 29

Bulbospongiosus Origin (Male)

Answer 29

Median raphe on ventral surface of bulb of penis; perineal body

Question 30

Bulbospongiosus Insertion (male)

Answer 30

Perineal membrane, dorsal aspect of corpus spongiosum and corpora cavernosa, and fascia of bulb of penis

Question 31

Bulbospongiosus Action (Male)

Answer 31

Supports and fixes perineal body/pelvic floor; compresses bulb of penis to expel last drops of urine/semen; assists erection by compressing outflow via deep perineal vein and by pushing blood from bulb into body of penis

Question 32

Bulbospongiosus Origin (female)

Answer 32

Perineal body

Question 33

Bulbopongiosus Insertion (female)

Answer 33

Pubic arch and fascia or corpora cavernosa of clit

Question 34

Bulbospongiosus Action (female)

Answer 34

Supports & fixes perineal body/pelvic floor; "sphincter" of vagina; assists in erection of clit; compresses greater vestibular gland

Question 35

Bulbospongiosus Innervation

Answer 35

Muscular (deep) branch of perineal nerve, a branch of pudendal nerve (S2-S4)

Question 36

Ischiocavernosus Origin

Answer 36

Internal surface of ischiopubic ramus and ischial tuberosity

Question 37

Ischiocavernosus Insertion

Answer 37

Inferior and medial aspects of crus and to perineal membrane medial to crus

Question 38

Ischiocavernosus Innervation

Answer 38

Muscular (deep) branch of perineal nerve, a branch of pudendal nerve (S2-S4)

Question 39

Ischiocavernosus Action

Answer 39

Maintains erection of penis or clit by compressing outflow veins and pushing blood from the root of penis or clit into the body of penis or clit