Quiz 5: Sacral Plexus Flashcards Preview

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Flashcards in Quiz 5: Sacral Plexus Deck (104)
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1

The sacral plexus is formed by what levels?

Anterior Primary Rami L4, L5, S1-S3 and part of S4.

2

The contributions from L4 and L5 are by way of what?

Lumbosacral Trunk

3

The sacral plexus forms on the anterior surface of what muscle?

Piriformis

4

The nerve roots that contribute to the sacral plexus divide into what divisions shortly after exiting their IVF/sacral foramen?

Anterior and Posterior divisions

5

What are the main nerves that branch off the anterior division of the sacral plexus?

1. Nerve to the quadratus femoris and gemellus inferior
2. Nerve to the obturator internus and gemellus superior
3. Pudendal Nerve
4. Muscular Branches
5. Pelvic Splanchnic Nerves

6

The Nerve to the Quadratus femoris and gemellus inferior contains fibers from what levels?

L4, L5 and S1

7

Where does the Nerve to the Quadratus femoris and gemellus inferior leave the pelvis?

Through the greater sciatic foramen

8

What is the function of the Quadratus femoris and Gemellus inferior muscles?

Contribute to lateral rotation and adduction of the thigh

9

The Nerve to the Obturator Internus and gemellus Superior contains fibers from what levels?

L5, S1 and S2

10

Where does the Nerve to the Obturator Internus and Gemellus Superior leave the pelvis?

Through the greater sciatic foramen

11

What does the Nerve to the Obturator Internus and Gemellus Superior give off branches to after leaving the pelvis through the greater sciatic foramen?

Branches to the Gemellus Superior

12

Where does the Nerve to the Obturator Internus and Gemellus Superior travel to after giving off branches to Gemellus Superior?

It re-enters the pelvis via the lesser sciatic foramen to supply the obturator internus.

13

What is the function of the Obturator Internus and Gemellus Superior muscles?

Contribute to lateral rotation and abduction of the thigh

14

The Pudendal Nerve contains fibers from what levels?

S2, S3, and S4

15

Where does the Pudendal Nerve leave the pelvic cavity?

Through the greater sciatic foramen

16

Where does the Pudendal Nerve travel after exiting the pelvis?

It arches around the ischial spine and into the perineum via the lesser sciatic foramen

17

After travelling through the lesser sciatic foramen where does the pudendal nerve travel?

It travels in the Pudendal Canal, inferior to the pubic symphysis to reach the dorsal side of the penis or clitoris.

18

What are the branches of the Pudendal Nerve that exit within the Pudendal Canal?

1. Inferior Rectal Nerves
2. Perineal Nerve
3. Dorsal Nerve of the Penis/Clitoris

19

Where do the inferior rectal nerves carry sensory information from?

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

20

Where do the inferior rectal nerves carry motor info?

External Anal Sphincter

21

What branches does the Perineal Nerve divide into?

Deep and Superficial Branches

22

Where do the deep branches of the Perineal Nerve carry motor info?

The following four muscles:
1. External Anal Sphincter
2. Bulbosponsiosus
3. Ischiocavernosus
4. Superficial Transverse Perineus

23

Where do the superficial branches of the Perineal Nerve carry sensory info from in males?

-Posterior scrotum
-Urethral mucosa
-Bulb of the Penis

24

Where do the superficial branches of the Perineal Nerve carry sensory info from in females?

-Labium majus
-External Urethral Oriface
-Vestibule

25

What is the terminal branch of the pudendal nerve?

Dorsal Nerve of the Penis/Clitoris

26

What muscles are supplied by the Dorsal Nerve of the Penis/Clitoris?

1. Deep Transverse Perineus
2. Urethral Sphincter Muscles

27

Where does the Dorsal Nerve of the Penis/Clitoris carry sensory info from in males?

-Corpus Cavernosum
-Glans Penis
-Skin covering the penis

28

Where does the Dorsal Nerve of the Penis/Clitoris carry sensory info from in females?

-Corpus Cavernosum
-Clitoris

29

Individual Muscular Branches off the sacral plexus contains fibers from what levels?

S4 only

30

What muscles do the Muscular Branches supply?

Levator Ani & Coccygeus Muscles