Dermatomes

Question 1

Which spinal nerve roots innervate the neck and diaphragm?

Answer 1

C2-C4 (need to transect more than one nerve root to lose complete sensation)

Question 2

What spinal nerve roots innervates the upper extremity? where are these sensory receptors?

Answer 2

C5-T1; shoulder, arm (brachia), forearm, wrist, hand

Question 3

A transection below which dermatome causes paraplegia?

Answer 3

T4 (nipple line)

Question 4

Which spinal nerve roots innervates the hip? foot? perianal region?

Answer 4

L1-L4; L5-S2; S3-S4