Upper Limb Nerves Brachial Plexus

Question 1

Orign from C5, sometimes also C4 anterior rami. Pierces middle scalene, descends deep to levator scapulae and rhomboids.

Answer 1

Dorsal Scapular n

Question 2

Supplies Rhomboids, occasionally levator scapulae

Answer 2

Dorsal Scapular n

Question 3

Origin from anterior rami C5, C6, C7. Through cervicoaxillary canal, decends inferiorly on serratus anterior

Answer 3

Long Thoracic n

Question 4

Supplies serratus anterior

Answer 4

Long Thoracic n

Question 5

Origin from Superior Trunk, fibers from C5,C6,C4, passes laterally across lateral cervical region (posterior triangle), superior to brachial plexus, through scapular

Answer 5

Suprascapular n

Question 6

Supplies Supra and Infra spinatus and glenohumeral joint

Answer 6

Suprascapular n

Question 7

C5, C6 and C4, Superior Trunk, Descends posterior to clavicle and anterior to brachial plexus and subclavian artery - often gives an accessory root to Phrenic Nerve

Answer 7

Nerve to Subclavius

Question 8

Supples subclavius and S.C. joint, accessory phrenic root supplies diaphragm

Answer 8

Nerve to Subclavius

Question 9

Lateral Cord, C5, C6, C7. Pierces Costocoracoid membrane to reach deep surface of pectoral muscles

Answer 9

Lateral pectoral n

Question 10

Supples Pectoralis major - some lateral bracnhes to pectoralis minor via medial pectoral nerve.

Answer 10

Lateral pectoral n

Question 11

Terminal branch of Lateral cord, C5-C7. Exits axilla by piercing coracobrachiallis, decends between biceps brachii and brachialis - continues as lateral cutaneous nerve of forearm

Answer 11

Musculocutaneous n

Question 12

Supplies muscles of anterior compartment of arm - coricobrachialis, biceps brachii, brachialis, skin of lateral forearm

Answer 12

Musculocutaneous n

Question 13

Formed from lateral and Medial roots from lateral and medial cords respectively., C6,C7 and C8,T1. Originates lateral to Axillary artery. Decends through arm adjacent to brachial artery, crossing anteriorly to become medial to the artery in the cubital fossa

Answer 13

Median n

Question 14

Supplies muscles of the anterior forearm compartment - except FCU and the ulnar half of FDP. Also 5 intrinsic muscles on thenar side of the palm and palmar skin

Answer 14

Median n

Question 15

Side branch of medial cord, C8,T1. Passes betwen axillary artery and vein then pierces pectoralis minor and enters deep surface of pectoralis major (actually runs lateral to lateral pectoral n but its name is derived from the cord it comes from)

Answer 15

Medial Pectoral n

Question 16

Side branch of medial cord, C8,T1, Smalles nerve of plexus, runs along medialy to axillary and brachial veins. Communicates with intercostobracial n

Answer 16

Medial cutaneous n of arm

Question 17

Supplies skin of medial side of arm

Answer 17

Medial cutaneous n of arm

Question 18

Supplies pectoralis minor and Sternocostal part of Pectoralis major

Answer 18

Medial Pectoral nerve

Question 19

Side branch of medial cord, C8, T1. Initially runs with ulnar nerve but pierces deep fascia with basilic vein, entering subcutaneous tissue, dividing into anterior and posterior branches

Answer 19

Medial cutaneous n of forearm

Question 20

Supplies skin of medial side of the forearm

Answer 20

Medial cutaneious n of the forearm

Question 21

Larger terminal branch of medial cord, C8, T1, often C7. Descends medial arm, passes posterior to medial epicondyl of humerus then descends medial side of forearm to the hand

Answer 21

Ulnar n

Question 22

Supplies FCU and medial half of FPD. Most of the intrinsic muscles of the hand, skin of hand

Answer 22

Ulnar n

Question 23

Supplies superior portion of subscapularis

Answer 23

Upper subscapular n

Question 24

Side branch of posterior cord. C5, Passes posteriorly, directly entering subscapularis

Answer 24

Upper subscapular n

Question 25

Supplies inferior portion of subscapularis and Teres Major

Answer 25

Lower subscapular n

Question 26

Side branch of posterior cord, C6. Passes inferiorlaterally, deep to subscapular artery and vein

Answer 26

Lower subscapular n

Question 27

Side branch of posterior cord, C6,C7,C8. Arises between upper and lower subscapular nerves. Runs inferiolaterally along poterior axillary wall to the apical part of latissimus dorsi

Answer 27

Thoracodorsal n

Question 28

Supplies latissimus dorsi

Answer 28

Thoracodorsal n

Question 29

Supplies ghelohumeral joint, teres minor and deltoid muscles, also skin of superolateral arm

Answer 29

Axillary n

Question 30

Smaller terminal branch of posterior cord, C5, C6. exits axillary fossa posteriorly - passes through quadrangular space with posterior circumflex humeral artery - gives rise to superior lateral cutaneous n of arm then winds around surgical neck of humerus, deep to deltoid

Answer 30

Axillary n

Question 31

Larger terminal branch of posterior cord (largest branch of plexus), C5-T1. Exits axillary fossa posterior to axillary artery. Passes posterior to humerousin radial grove with deep brachial artery between lateral and medial heads of triceps. Perforates lateral intermuscular septum - enters cubital fossa dividing into superficial and deep nerves which are cutaneous and motor respectively

Answer 31

Radial n

Question 32

Supplies all muscles of posterior compartment of arm and forearm. Skin of posterior and inferolateral arm, posterior forearm and dorsum of hand.

Answer 32

Radial n