Ch. 13- Peripheral Nervous System

Question 1

Spinal Nerves

Answer 1

exist in intervertebral foramen; ventral and dorsal roots coming together

Question 2

How many pairs of spinal nerves?

Answer 2

31 pairs; 8 Cervical (C1 exits above atlas; C8 exits below C7)
12 thoracic
5 lumbar
5 sacral
1 coccygeal
(lumbar, sacral and coccygeal form Cauda Equina)

Question 3

Nerve Plexuses

Answer 3

formed by ventral primary rami of spinal nerves

Question 4

3 peripheral nerve plexuses

Answer 4

Cervical plexus (C1-C4); Brachial plexus (C5-T1); Lumbosacral plexus (L1-S4)

Question 5

Cervical Plexus

Answer 5

(C1-C4)
Phrenic nerve (C3-C5) supplies diaphragm

Question 6

Brachial plexus

Answer 6

(C5-T1)
MARMU- musculotaneous, axillary, radial, median and ulnar nerves
common injury- stinger injury

Question 7

Lumbosacral plexus

Answer 7

(L1-S4)
Femoral, Obturator, Pudendal & Sciatic nerve (longest nerve in the body)
common injury- sciatic=pinched nerve

Question 8

Why do T2-T12 differ from rest of spinal nerves?

Answer 8

Ventral Rami don’t form plexus; intercostal nerves

Question 9

Dermatome

Answer 9

area of skin supplied by a single spinal nerve; sensory