pelvis

Question 1

what makes the boundaries of the pelvic outlet

Answer 1

symphasis pubis
ischiopubic rami
ischial tuberosities
sacrotuberous ligaments
coccyx

Question 2

the obturator nerve and vessels pass through which structure

Answer 2

obturator foramen

obturator canal, formd by the obturator membrane across obturator foramen

Question 3

what passes through the obturator foramen?

Answer 3

obturator nerve and vessels

Question 4

what passes through the greater sciatic foramen?

Answer 4

piriform muscle tendon
nerves of the sacral plexus
branches of the internal iliac vessels

Question 5

piriform muscle tendon, nerves of the sacral plexus, and branches of the internal iliac vessels pass thorugh what structure?

Answer 5

greater sciatic foramen

Question 6

what passes through the lesser sciatic foramen

Answer 6

obturator internus muscle
internal pudendal vessels
pudendal nerve

enter the ischiorectal fossa

Question 7

the obturator internus muscle, internal pudendal vessels, and the pudendal nerve pass through what structure

Answer 7

lesser sciatic foramen

Question 8

what muscles form the lateral wall of the pelvis?

Answer 8

obturator internus

piriformis

Question 9

piriformis

origin

Answer 9

within the pelvic cavity ; from the anterior aspect of the sacrum and the sacrotuberous ligament

Question 10

piriformis

insertion

Answer 10

greater trochanter of femur

Question 11

piriformis

innervation

Answer 11

ventral rami of S1 and S2 (posterior division of the sacral plexus)

Question 12

piriformis

action

Answer 12

lateral rotator of thigh when hip is extended

abductor of the hip when thigh is flexed

Question 13

obturator internus

origin

Answer 13

internal surface of the margins of the obturator foramen/obturator membrane

passes through the lesser sciatic foramen

Question 14

obturator internus

insertion

Answer 14

converges into a tendon and inserts onto greater trochanter of femur

Question 15

name the muscles that instert on the greater trocanter

Answer 15

obturator internus

piriformis

Question 16

obturator internus

action

Answer 16

laterally rotates the thigh when hip is extended

Question 17

obturator internus

innervation

Answer 17

nerve to obturator internus
L5-S1-S2
from anterior div of sacral plexus

Question 18

name the muslces of the pelvic floor

Answer 18

levator ani m
coccygeus m

(pelvic diaphragm)

Question 19

levator ani - name the three muscles

Answer 19

puborectalis
pubococcygeus
iliococcygeus

Question 20

levator ani

origin

Answer 20

pelvic surface of the body of the pubis and the ischial spine

also arises from the tendinous arch (arcus tendinous) formed by thickening of the fascia of the obturator internus m

Question 21

levator ani

insertion

Answer 21

central perineal tendon/perineal body
external anal sphincter
anococcygeal raphe
coccyx

Question 22

levator ani

innervation

Answer 22

anterior primary rami of S3 and S4 (anterior division of sacral plexus)

nerve to levator ani + coccygeus

Question 23

levator ani

action

Answer 23

support the pelvic contents

important for micturirion and defecation

Question 24

coccygeus

origin

Answer 24

ischial spine and sacrospinous ligament

Question 25

coccygeus

insertion

Answer 25

lateral margins of the fifth sacral vertebra and coccyx

Question 26

coccygeus

action

Answer 26

acts with the levator ani to support pelvic contents

Question 27

coccygeus

innervation

Answer 27

innervated by anterior ventral rami from S4 and S5

anterior div of sacral plexus