Important Review Items

Question 1

Axillary nerve innervates

Answer 1

Deltoid (flexion/extension, adduction/abduction, IR/ER) and teres minor (external rotation and adduction)

Question 2

Radial nerve innervates

Answer 2

POSTERIOR COMPARTMENT OF ARM (extension of forearm) AND FOREARM (extend wrist and digits, supinate the hand, extend/abduct thumb.

ARM: triceps brachii
FOREARM: extensor carpi ulnaris, extensor carpi radialis longus and brevis, extensor digitorum, extensor indicis, extensor digiti minimi, extensor pollicis longus and brevis, abductor pollicis longus, supinator, brachioradialis

Question 3

Ulnar nerve innervates

Answer 3

FOREARM: flexor carpi ulnaris, medial/ulnar half of flexor digitorum profundus
HAND: hypothenar muscles (abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi), 3rd and 4th lumbricals, palmar and dorsal interosseous muscles, adductor pollicis.

Question 4

Median nerve innervates

Answer 4

ANTERIOR COMPARTMENT OF FOREARM (flex wrist and digits, pronate the hand, flex the thumb, adduct/abduct hand) EXCEPT FOR flexor carpi ulnari and ulnar/medial half of flexor digitorum profundus (ulnar nerve)

HAND: thenar muscles (abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis), 1st and 2nd lumbricals

FOREARM: pronator teres, flexor carpi radialis, flexor carpi ulnaris, palmaris longus, flexor digitorum superficialis, flexor digitorum profundus, pronator quadratus

Question 5

Musculocutaneous nerve innervates

Answer 5

ANTERIOR COMPARTMENT OF ARM (flex arm and forearm and supinate hand)

Biceps brachii, brachialis, coracobrachialis

Question 6

Lateral pectoral nerve innervates

Answer 6

pectoralis major (adduction and internal rotation of arm)

Question 7

Suprascapular nerve innervates

Answer 7

supraspinatus (initiate and assist abducting arm) and infraspinatus (external rotation, adduction, abduction of arm)

Question 8

Long thoracic nerve innervates

Answer 8

serratus anterior (protract and upwardly rotate scapula)

Question 9

Upper subscapular nerve innervates

Answer 9

subscapularis ( internal rotation of arm)

Question 10

lower subscapular nerve innervates

Answer 10

subscapularis (internal rotation of arm) and teres major (internal rotation, adduction, and extension of arm)

Question 11

Thoracodorsal nerve innervates

Answer 11

latissimus dorsi (internal rotation, adduction, extension of arm, and respiration (“cough muscle”)

Question 12

Medial pectoral nerve innervates

Answer 12

pectoralis major (adduction and internal rotation of arm) and pectoralis minor (draws scapula downward)

Question 13

Medial brachial cutaneous nerve innervates

Answer 13

sensory only

Question 14

Medial antebrachial cutaneous nerve innervates

Answer 14

sensory only

Question 15

“Winging” of scapula

Answer 15

paralysis of long thoracic nerve, which innervates serratus anterior

Question 16

Dorsal scapular nerve

Answer 16

levator scapulae, rhomboid minor, and rhomboid major

Question 17

Branches of Axillary nerve

Answer 17

superior lateral brachial cutaneous nerve

Question 18

Branches of radial nerve

Answer 18

Deep branch AKA posterior interosseous nerve

Question 19

Branches of musculocutanous nerve

Answer 19

lateral antebrachial cutaneous nerve - purely sensory