Exam 3: Sacral Spinal Nerves

Question 1

___ pairs of sacral spinal nerves

Answer 1

5

Question 2

Sacral spinal nerves descend ____ and form much of ____

Answer 2

Inside dura; cauda equina

Question 3

Each sacral N divides into

Answer 3

Anterior and posterior primary rami

Question 4

The posterior primary rami of S1-4 travel through

Answer 4

4 posterior sacral foramina

Question 5

S5 posterior ramus travels through

Answer 5

Sacral hiatus

Question 6

Sacral posterior primary rami ____ in size from superior to inferior

Answer 6

Decrease

Question 7

Posterior primary rami of S1-3 divide into

Answer 7

Medial and lateral branches

Question 8

Medial branches of posterior primary rami supply

Answer 8

Multifidi

Question 9

Lateral branches of posterior primary rami combine w/ branches from ____ to supply ____

Answer 9

L5/S4; skin over buttocks

Question 10

Posterior primary rami of S4 and S5 unite w/ ____ to supply ____

Answer 10

Coccygeal posterior rami; skin over coccyx

Question 11

Anterior primary rami of S1-4 travel through

Answer 11

Anterior sacral foramina

Question 12

Anterior primary rami contribute to

Answer 12

Sacral (S1-4) plexus

Coccygeal (S4,5) plexus

Question 13

Usually ____ sacral sympathetic ganglia

Answer 13

3 or 4

Question 14

Anterior primary ramus of each sacral N will receive post sympathetic fibers via

Answer 14

Gray ramus communicans