Segmental Innervation for Neuro Screening

Question 1

C3/4 (motor)

Answer 1

upper trapezius/shoulder shrugging

C4 = primary

Question 2

C5/6 (motor)

Answer 2

Deltoid/shoulder abduction - C5 = primary

biceps/elbow flexion

Question 3

C6/7 (motor)

Answer 3

triceps/elbow extension

Question 4

C7/8 (motor)

Answer 4

wrist flexion, FCU

Question 5

C8/T1 (motor)

Answer 5

interossei/finger abduction

Question 6

L1/2/3 (motor)

Answer 6

Iliopsoas/hip flexion

L1 and 2 = primary

Question 7

L2/3/4 (motor)

Answer 7

quadriceps/knee extension

L3/4 = primary

Question 8

L4/5 (motor)

Answer 8

tibialis anterior/repeated DF with knee relaxed or resisted DF in supine
L4 = primary

Question 9

L5 (motor)

Answer 9

EHL/great toe extension

Question 10

S1/2 (motor)

Answer 10

Gastrocnemius

Question 11

C5 (sensory)

Answer 11

deltoid region (anteriorly)

Question 12

C6 (sensory)

Answer 12

thumb

Question 13

C7 (sensory)

Answer 13

middle finger

Question 14

C8 (sensory)

Answer 14

ulnar side of forearm and hand

Question 15

T1 (sensory)

Answer 15

medial side of upper arm

Question 16

L2 (sensory)

Answer 16

proximal anterior thigh

Question 17

L4 (sensory)

Answer 17

medial leg

Question 18

L5 (sensory)

Answer 18

upper lateral leg or dorsum of foot btwn great toe and 2nd toe

Question 19

S1 (sensory)

Answer 19

lateral surface of foot