Pelvis Somatic Nerves

Question 1

The obturator nerve is part of what plexus?

Answer 1

lumbar

Question 2

Obturator n arises from which lumbar cord segments?

Answer 2

L2-4

Question 3

Obturator n enters the pelvis where?

Answer 3

along medial border of psoas major m

Question 4

Where does the obturator n pass?

Answer 4

passes along the lateral wall of pelvis to obturator canal,

Question 5

What is the obturator canal?

Answer 5

an opening in obturator membrane that otherwise fills obturator foramen

Question 6

Where does the obturator nerve exit the pelvis?

Answer 6

via obturator canal with obturator AV

Question 7

What does the obturator n innervate?

Answer 7

adductors of medial thigh

Question 8

Compression of obturator nerve during childbirth causes what?

Answer 8

painful spasms in thigh adductors and sensory deficits in the medial thigh

Question 9

What ventral rami make up the lumbosacral trunk?

Answer 9

L4-5

Question 10

The lumbosacral trunk is medial to what structure?

Answer 10

psoas major m

Question 11

lumbosacral trunk passes anterior to ?

Answer 11

ala of sacrum to join sacral plexus

Question 12

What nerves make up the sacral plexus?

Answer 12

sciatic, pudendal, superior gluteal, inferior gluteal

Question 13

the sacral plexus lies on the pelvic surface of which muscle?

Answer 13

piriformis

Question 14

What rami make up the sacral plexus?

Answer 14

L4-S4

Question 15

most branches of sacral plexus exit pelvis via?

Answer 15

greater sciatic foramen

Question 16

What is the largest and broadest nerve in teh body?

Answer 16

sciatic

Question 17

Sciatic nerve is formed by what ventral rami?

Answer 17

L4-S3, converge on anterior surface of piriformis m

Question 18

Where does the sciatic nerve exit?

Answer 18

exits pelvis inferior to piriformis m via greater sciatic foramen –> enters gluteal region and descends thru posterior thigh

Question 19

What does the sciatic nerve innervate?

Answer 19

posterior thigh and entire leg and foot

Question 20

What is the main motor and sensory nerve of perineum?

Answer 20

pudendal n

Question 21

pudendal n is the primary sensory innervation of ?

Answer 21

external genitalia

Question 22

What does the pudendal nerve terminate as?

Answer 22

dorsal n of penis/clitoris?

Question 23

The pudendal n is formed by anterior division of what ventral rami?

Answer 23

S2-S4

Question 24

Where does the pudendal nerve exit?

Answer 24

exits pelvis with internal pudendal AV via greater sciatic foramen

Question 25

The pudendal nerve T/F passes anterior to the ischial spine and over sacrospinous lig

Answer 25

F, passes posterior

Question 26

How does the pudendal nerve enter perineum?

Answer 26

by passing thru lesser sciatic foramen

Question 27

Superior gluteal n arises from posterior division of which ventral rami?

Answer 27

L4-S1

Question 28

How does the superior gluteal n exit the pelvis?

Answer 28

superior to piriformis via greater sciatic foramen

Question 29

Does the superior gluteal n parallel the superior gluteal AV

Answer 29

yep

Question 30

What does the superior gluteal n supply?

Answer 30

glut med, glut min, TFL

Question 31

Inferior gluteal n arises from posterior division of which ventral rami?

Answer 31

L5-S2

Question 32

How does the inferior gluteal n exit the pelvis?

Answer 32

inferior to piriformis via greater sciatic foramen, parallels inferior gluteal AV

Question 33

what does the inferior gluteal n innervate?

Answer 33

glut max

Question 34

What ventral rami make up the coccygeal plexus?

Answer 34

small network arising from S4-S5 ventral rami

Question 35

Where can you find the coccygeal plexus?

Answer 35

on pelvic surface of coccygeus m

Question 36

What does the coccygeus plexus n innervate?

Answer 36

coccygeus m and levator ani m and skin between coccyx and anus