UE Muscles & Innervations

Question 1

Dorsal Scapular Nerve (C4-C5)

Answer 1

• Levator Scap
• Rhomboids

Question 2

Suprascapular Nerve (C4-C6)

Answer 2

• Supraspinatus
• Infraspinatus

Question 3

Nerve to Subclavian (C5-6)

Answer 3

• Subclavian

Question 4

Subscapular Nerve (C5-6)

Answer 4

• Subscapularis
• Teres Major

Question 5

Axillary Nerve (C5-6)

Answer 5

• Deltoid
• Teres Minor

Question 6

Lateral Pectoral Nerve (C5-7)

Answer 6

• Pec Major

Question 7

Musculocutaneous Nerve (C5-7)

Answer 7

• Brachialis
• Biceps
• Coracobrachialis

Question 8

Median Nerve (C5-T1)

Answer 8

• Lateral two lumbricals
• Opponens pollicis
• Abductor pollicis brevis
• Flexor pollicis brevis
• (pronator teres, palmaris longus, flexor digitorum superficialis, and flexor carpi radialis)

Question 9

Thoracodorsal Nerve (C6-8)

Answer 9

• Lattisimus Dorsi

Question 10

Radial Nerve (C5-8)

Answer 10

• Brachioradialis
• Extensor Carpi radialis longus
• Anconeous
• Supinator
• Triceps

Question 11

Long Thoracic Nerve (C5-7)

Answer 11

• Serratus Anterior

Question 12

Medial Pectoral Nerve (C8-T1)

Answer 12

• Pec minor

Question 13

Ulnar Nerve (C8-T1)

Answer 13

• “all the rest” — most intrinsic hand muscles not supplied by the median nerve, including the adductor pollicis and flexor carpi ulnaris
• Medial two lumbricals
• Palmaris brevis
• Interossei of hand
• Hypothenar

Question 14

Levator Scap

Answer 14

• Elevation of shoulder
• Retraction of shoulder

Question 15

Rhomboids

Answer 15

• Retraction of scapula

Question 16

Supraspinatus

Answer 16

• Abduction of arm
• Stabilizes humeral head

Question 17

Infraspinatus

Answer 17

• ER of arm
• Stabilizes shoulder

Question 18

Subscapularis

Answer 18

• IR of arm
• Adduction of arm

Question 19

Serratus Anterior

Answer 19

• Protraction of shoulder
• Stabilizes scapula

Question 20

Lattisimus Dorsi

Answer 20

• Adduction of shoulder
• Extension of arm
• IR of shoulder

Question 21

Pec Major

Answer 21

• Adduction
• IR
• Flexion (clavicular head)
• Extension (sternocostal head)

Question 22

Pec Minor

Answer 22

• Depression
• Protraction
• IR

Question 23

Deltoid

Answer 23

• Abduction

Question 24

Teres Minor

Answer 24

• ER of shoulder
• Adduction of arm

Question 25

Teres Major

Answer 25

• IR of shoulder
• Extension of arm

Question 26

Biceps brachii

Answer 26

• Forearm flexion
• Supination

Question 27

Brachialis

Answer 27

• Forearm flexion

Question 28

Brachioradialis

Answer 28

• Forearm Flexion (beer raising muscle)