Brachial Plexus

Question 1

What are the parts of the brachial plexus?

Answer 1

Roots, trunks, divisions, cords, branches

Question 2

Upper trunk

Answer 2

C5, C6

Question 3

Middle trunk

Answer 3

C7

Question 4

Lower trunk

Answer 4

C8, T1

Question 5

What are the divisions?

Answer 5

anterior and posterior of all 3 trunks

Question 6

Posterior cord

Answer 6

made up of all posterior divisions

Terminal branches are Axillary and Radial nerves

Question 7

Lateral cord

Answer 7

Anterior divisions of upper and middle trunk
C5-C7
Terminal branches are Musculocutaneous and part of Median

Question 8

Medial cord

Answer 8

Anterior divisions of lower trunk
C8-T1
Terminal branches are Ulnar and part of Median

Question 9

Branches from the roots

Answer 9

Dorsal scapular (C5)
Long thoracic (C5-C7)

Question 10

Branches from the trunks

Answer 10

Suprascapular (C5-C6)

N to subclavius m (C5-C6)

Question 11

Branches from the lateral cord

Answer 11

Lateral pectoral (C5-C7)

Question 12

Branches from the posterior cord

Answer 12

Upper subscapular (C5-C6)
Thoracodorsal (C6-C8)
Lower subscapular (C5-C6)

Question 13

Branches from medial cord

Answer 13

Medial pectoral (C8-T1)
Medial brachial cutaneous (C8-T1)
Medial antebrachial cutaneous (C8-T1)

Question 14

C5 action

Answer 14

shoulder abduction

Question 15

C5-C6 action

Answer 15

Elbow flexion

Question 16

C6-C7 action

Answer 16

wrist and finger extension, shoulder adduction

Question 17

C7-C8 action

Answer 17

elbow extension

Question 18

C7-T1 action

Answer 18

wrist and finger flexion, finger ab/adduction

Question 19

Muscle reflex testing

Answer 19

C5: biceps reflex
C6: brachioradialis reflex
C7: triceps reflex

Question 20

Areas to test for function of peripheral nerves

Answer 20

Axillary: lateral deltoid
Musculocutaneous: lateral forearm
Radial: dorsum of webbing between thumb and index finger
Median: tip of index finger
Ulnar: medial tip of pinky

Question 21

Dr. Cuma

Answer 21

Drop - Radial
Claw hand - Ulnar
Median - Ape hand

Question 22

Dorsal Scapular innervates

Answer 22

Rhomboid major/minor, levator scapulae

Question 23

Axillary innervates

Answer 23

Deltoid, teres minor

Question 24

Subscapular innervates

Answer 24

Teres major, subscapularis

Question 25

Suprascapular innervates

Answer 25

Infraspinatus, supraspinatus

Question 26

Lateral pectoral innervates

Answer 26

Pec major

Question 27

Medial pectoral innervates

Answer 27

Pec major/minor

Question 28

Musculocutaneous innervates

Answer 28

Biceps brachii, coracobrachialis, brachialis

Question 29

Median innervates

Answer 29

Pronator teres, palmaris longus, flexor carpi radialis, flexor digitorum superficialis, lateral 2 lumbricals

Question 30

Ulnar innervates

Answer 30

Flexor carpi ulnaris, medial half of flexor digitorum profundus, abductor digiti minimi, flexor digiti minimi, opponens digiti minimi

Question 31

Deep branch of ulnar innervates

Answer 31

Medial 2 lumbricals, dorsal interossei, palmar interossei, adductor pollicis

Question 32

Recurrent branch of Median innervates

Answer 32

Abductor pollicis brevis, flexor pollicis brevis, opponens pollicis

Question 33

Radial innervates

Answer 33

Triceps brachii, anconeus, brachioradialis

Question 34

Deep branch of Radial innervates

Answer 34

Extensor carpi radialis longus, extensor carpi ulnaris, extensor digitorum, extenstor digiti minimi, supinator

Question 35

Posterior interosseous innervates

Answer 35

Abductor pollicis longus, extensor pollicis longus, extensor pollicis brevis, extensor indicis

Question 36

Anterior interosseous innervates

Answer 36

Lateral half of flexor digitorum profundus, flexor pollicis longus, pronator quadratus