Myotomes

Question 1

What is the muscle and action of C4?

Answer 1

• trapezius: shoulder shrug

Question 2

What is the muscle and action of C5?

Answer 2

-deltoid: shoulder flexion and abduction

Question 3

What is the muscle and action of C5,C6?

Answer 3

-Biceps: Elbow flexion
-extensor carpi radialis longus and brevis: wrist extension

Question 4

What is the muscle and action of C7?

Answer 4

• Triceps: elbow extension
• flexor carpi radialis longus and ulnaris: wrist flexion

Question 5

What is the muscle and action of C8?

Answer 5

flexor carpi ulnaris and extensor carpi ulnaris: ulnar deviation

Question 6

What is the muscle and action of T1?

Answer 6

Interossei: digit abduction and adduction

Question 7

What is the muscle and action L2,L3?

Answer 7

illiopsoas: hip flexion

Question 8

What is the muscle and action of L2,L3,L4?

Answer 8

Quadriceps: Knee extension

Question 9

What is the muscle and action of L4?

Answer 9

anterior tibialis: ankle dorsiflexion

Question 10

what is the muscle and action of L5?

Answer 10

Extensor hallucis longus: extension of the great toe

Question 11

What is the muscle and action of S1?

Answer 11

gastroc: plantarflexion
fibularis brevis and longus: eversion