Brachial Plexus

Question 0

Long thoracic N.

Answer 0

O: posterior aspect of anterior rami of C5 C6 C7
SI: Serratus anterior

Question 1

Dorsal scapular N.

Answer 1

O: posterior aspect of anterior ramus of C5 with frequent contribution from C4
SI: Rhomboids; occasionally supplies Levator

Question 2

Supra scapular N.

Answer 2

O: superior trunk receiving fibers from C5 C6 often C4
SI: supraspinatus and infraspinatus muscles

Question 3

Nerve to Subclavius

Answer 3

O: superior trunk, receiving fibers from C5, C6 and often C4
SI: Subclavius and sternoclavicular joint

Question 4

Lateral Pectoral N.

Answer 4

O: lateral cord, receiving fibers from C5,C6,C7
SI: primarily Pectoralis major, but sometimes Pectoralis minor.

Question 5

Median N.

Answer 5

O: lateral root: Terminale branch of lateral cord (C6, C7 fibers);
medial root: terminal branch of medial cord (C8, T1 fibers)
SI: muscles of anterior forearm compartment (except for flexor carpi ulnaris and ulnar half of flexor digitorum profundus), five intrinsic muscles, half of palm and palmar skin

Question 6

musculocutaneous N.

Answer 6

O: terminal branch of lateral cord receiving fibers from C5-C7
SI: muscles of anterior compartment of arm, (coracobrachialis, biceps brachii, and brachialis); skin of lateral aspect of forearm

Question 7

medial pectoral N.

Answer 7

O: side branches of medial cord receiving fibers from C8,T1
SI: Pec minor and Sternocostal part of pec major

Question 8

Medial cutaneous nerve of arm

Answer 8

O: side branches of medial cord receiving fibers from C8,T1
SI: skin of medial side of arm, as far distal as medial epicondyle of humerus and olecranon of ulna

Question 9

Median cutaneous nerve of forearm

Answer 9

O: Side branches of medial cord, receiving fibers from C8,T1
SI: skin of medial side of forearm, as far distal as wrist

Question 10

Ulnar N.

Answer 10

O:Larger terminal branch of medial cord, receiving fibers from C8,T1, and often C7
SI:Flexor carpi ulnaris and ulnar half of flexor digitorum profundus (forearm); most intrinsic muscles of hand, skin of hand medial to axial line of digit 4

Question 11

upper Subscapular N.

Answer 11

O: side branch of posterior cord, receiving fibers from C5
SI:Superior portion of subscapularis

Question 12

Lower subscapular N.

Answer 12

O: side branch of posterior cord, receiving fibers from C6
SI: inferior portion of subscapularis and teres major

Question 13

Thoracodorsal N.

Answer 13

O: side branch of posterior cord, receving fibers from C6,7,8
SI: latissimus dorsi

Question 14

Axillary N.

Answer 14

O: terminal branch of posterior cord, receiving fibers from C5,6
SI: glenohumeral joint, teres minor, and deltoid muscles, skin of superolateral arm (over inferior part of deltoid)

Question 15

Radial N.

Answer 15

O: larger terminal branch of posterior cord (largest branch of plexus), receiving fbers from C5-T1
SI: All muscles of posterior forearm, skin of posterior and inferolateral arm, posterior forearm, and dorsum of hand lateral to axial line of digit 4