key muscles by segmental innervation

Question 1

What key muscles are innervated by C3?

Answer 1

sternocleidomastoid, partial diaphragm, upper trap

Question 2

What key muscles are innervated by C4?

Answer 2

diaphragmatic, partial deltoid, sternocleidomastoid, upper trap

Question 3

What muscles are innervated by C5?

Answer 3

deltoid, biceps, rhomboids, brachioradialis, teres minor, infraspinatus, serratus anterior

Question 4

What muscles are innervated by C7?

Answer 4

Triceps, flexor carpi radialis, latissimus, pronator teres

Question 5

What muscles are innervated by C8?

Answer 5

flexor carpi ulnaris, extensor carpi ulnaris; patient may have some hand intrinsics

Question 6

What muscles are innervated by T1-T8?

Answer 6

hand intrinsics, top half of the intercostals, pectoralis major (sternal portion)

Question 7

What muscles are innervated T7-T9?

Answer 7

upper abdominals

Question 8

What muscles are innervated by T9-T12?

Answer 8

lower abdominals

Question 9

What muscles are innervated by L2?

Answer 9

Illiopsoas, weak sartorious, weak adductors, weak rectus femoris

Question 10

What muscles are innervated by T12?

Answer 10

lower abdominals, weak quadratus lumborum

Question 11

What key muscles are innervated by L4?

Answer 11

gluteus medius, TFL, hamstrings, tibialis anterior

Question 12

What key muscles are innervated by L3?

Answer 12

sartorius, rectus femoris, adductors

Question 13

What key muscles are innervated by L5?

Answer 13

weak gluteus maximus, long toe extensors, tibialis posterior

Question 14

What key muscles are innervated by S1?

Answer 14

gluteus maximus, ankle plantar flexors (gastrocnemius, soleus)

Question 15

What key muscles are innervated by spinal level S2?

Answer 15

anal spincter

Question 16

What key muscles are innervated by C1-C2 ?

Answer 16

facial muscles, partial sternoclediomastoid, capital muscles