Dermatomes and Myotomes

Question 1

dermatome

Answer 1

A unilateral area of skin innervated by the nerve fibers of a single spinal nerve that originated from a single spinal cord segment.

There is considerable overlap peripherally in the skin between adjacent dermatomes

Question 2

myotome

Answer 2

Spinal Nerves Innervating Groups of Muscles

Question 3

C-5

Answer 3

Upper extremity abductors (deltoid, biceps brachii)

Question 4

C-5/6

Answer 4

Forearm flexors (biceps brachii, brachioradialis) forearm pronators

Question 5

C-7

Answer 5

Forearm extensor (triceps brachii), Wrist extensors, Finger extensors

Question 6

C-8/T1

Answer 6

Intrinsic hand muscles

Question 7

L-2

Answer 7

Thigh flexion (iliopsoas)

Question 8

L-3/4

Answer 8

Leg extension (quadriceps) (knee jerk reflex)

Question 9

L-4/5

Answer 9

Foot dorsiflexors and Toe extensors (anterior tibial muscles)

Question 10

S-1/2

Answer 10

Foot plantar flexors and Toe flexors (posterior tibial muscles) (Achilles
tendon reflex)

Question 11

S-2,3,4

Answer 11

Anal contraction