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Flashcards in Sacral plexus Deck (73)
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what forms the sacral plexus

anterior primary rami of L4,L5 S1-S3 and part of S4

1

L4 and L5 are able to contribute to the sacral plexus due to what

the lumbosacral trunk

2

where does the sacral plexus form

on the piriformis muscle

3

where do the nerve roots that contribute to the sacral plexus divide into anterior and posterior divisions

shortly after exiting their IVF/sacral foramina

4

what roots contribute to quadratus femoris and gemllus inferior nerve

L4,L5, and S1

5

how does the nere to the quadratus femoris and gemellus inferior leave the pelvis

through the greater sciatic foramen

6

what is the action of the quadratus femoris and inferior gemellus

lateral rotation and adduction of the femur

7

what roots contribute to the nerve to the obturator internus and gemellus superior

L5, S1 and S2

8

how does the nerve to the obturator internus and gemellus superior leave the pelvis

through the greater sciatic foramen gibing off branches to the gemllus superior

9

how does the nerve to the obturator internus and gemllus superior supply the obturator internus

after exiting the pelvis it reenters the pelvis via the lesser sciatic foramen

10

what is the action of the obturator internus and gemllus superior

lateral rotation and abduction of the femur

11

what roots contribute to the pudendal nerve

S2,S3, and S4

12

what branches come off of the pudendal nerve within the pudendal cnal

the inferior rectal nerves, perineal nerve, and the dorsal nerve of the penis/clitoris

13

what sensory information does the inferior rectal nerves carry

the skin around the anus and the inferior 2/3 of the anal canal

14

what muscles are innervated by the inferior rectal nerves

the external anal sphincter

15

what does the perineal nerve divide into

deep and superficial branches

16

what muscles are supplied by the deep branches of the perineal nerve

the external anal sphincter, bulbocavernous , ishiocavernous, superficial transverse perineus

17

the deep branches of the perineal nerve carry primarily what type of information

motor

18

the superficial branches of the perineal nerve carry primarily what type of information

sensory

19

what does the superficial branches of the perineal nerve supply in males

posterior scrotum, urethral mucosa and bulb of the penis

20

what does the superficial branches of the perineal nerve supply in females

labium majus, external urethral orifice and vestibule

21

what is the terminal branch of the pudendal nerve

the dorsal nerve of the penis/clitoris

22

what muscles does the dorsal nerve of the penis/clitoris supply

deep transverse perineus, urethral sphincter muscles

23

what sensory information is carried in the dorsal nerve of the penis/clitoris

in males the corpus cavernosum, glans penis and skin covering the penis

in females the corpus cavernosum, and clitoris

24

what do individual muscular branches from the anterior division of the sacral plexus that contain S4 fibers supply

levator ani and cocygeus muscles

25

what type of information do pelvic splanchnic nerves carry

parasympathetic

26

what are the nerves that come off the posterior division of the sacral plexus

the nerve to the piriformis, superior gluteal nerve, inferior gluteal nerve, and the perforating cutaneous nerve

27

what fibers contribute to the nerve to the piriformis

S1, S2

28

what roots contribute to the superior gluteal nerve

L4,L5, and S1

29

what does the superior branch of the superior gluteal nerve supply

the gluteus medius and gluteus minimus