Somatic Spinal Nerves (Peripheral)

Question 1

somatic spinal nerves

Answer 1

-belong to peripheral nervous system
-mixed nerve bundles (sensory and motor)
-31 pairs; exit via intervertebral foramen
~8 cervical
~12 thoracic
~5 lumbar }
~5 sacral }cauda equina(below L-2)
~1 coccygeal }

Question 2

Cervical plexus #1

Answer 2

A). C-1 to C-4
B). innervates neck, jaw, and diaphragm
-phrenic nerve

Question 3

Brachial plexus #2:

Answer 3

A). C-5 to C-8 (plus T-1)
B). innervates shoulder/arm
       -musculocutaneous nerve 
       -radial nerve
       -median nerve
       -ulnar nerve

Question 4

Lumbar plexus #3

Answer 4

A). T-12 (plus L-1 to L-4) 
B). innervates abdominal wall and thigh
       -femoral nerve 
       -lateral femoral (cutaneous) 
       -genitofemoral 
       -iliohypogastric

Question 5

Sacral plexus #4

Answer 5

A).L-5 (plus S-1 to S-4)
B). innervates gluteal region and posterior leg.
-sciatic nerve (tibials + common fibular)
-pudendal nerve
-gluteals