Segmental Innervation of Muscles

Question 1

Elevation of eyelids, movement of eyes - CN III, IV, V.

Answer 1

Extraocular

Question 2

Closing and opening of jaw - CN V (motor)

Answer 2

Masseters, Pterygoids

Question 3

Protrusion of tongue - CN XII.

Answer 3

Lingual muscle

Question 4

Phonation and swallowing - CN IX, X.

Answer 4

Palatal, Laryngeal, and Pharyngeal muscles

Question 5

Elevation of shoulders, anteroflexion and turning of head - CN XI.

Answer 5

Trapezius and sternocleidomastoid

Question 6

Adduction of extended arm - C5,C6 (brachial plexus).

Answer 6

Pectoralis major

Question 7

Initiation of abduction of arm - C5,C6 (brachial plexus).

Answer 7

Supraspinatus

Question 8

Fixation of scapula - C5,C6,C7 (brachial plexus).

Answer 8

Serratus anterior

Question 9

External rotation of flexed arm - C5,C6 (brachial plexus).

Answer 9

Infraspinatus

Question 10

Abduction and elevation of arm up to 90 degrees - C5,C6 (axilliary nerve).

Answer 10

Deltoid

Question 11

Flexion of supinated forearm - C5,C6 (musculocutaneous).

Answer 11

Deltoid

Question 12

Extension of forearm - C6,C7,C8 (radial).

Answer 12

Triceps

Question 13

Closure of eyes, pursing of lips, exposure of teeth - CN VII.

Answer 13

Orbicularis oculi and Orbicularis oris