Brachial Plexus

Question 1

Divisions of the brachial plexus in order from proximal to distal

Answer 1

Roots, trunks, divisions, cords, branches

Question 2

Mnemonic for brachial plexus divisions

Answer 2

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Question 3

Somatic network of nerves formed by the union of the ventral rami of spinal nerves C5-C8 and T1

Answer 3

brachial plexus

Question 4

Spinal nerves which make up the brachial plexus

Answer 4

C5-C8, T1

Question 5

The clavicle divides the brachial plexus into…

Answer 5

the supraclavicular and infraclavicular part of brachial plexus

Question 6

Branches from the brachial plexus which separate directly from the roots (2)

Answer 6

dorsal scapular and long thoracic nerves

Question 7

Branches from root of C5 in brachial plexus. Motor innervation to levator scapulae, rhmoboid major, and rhomboid minor muscles.

Answer 7

dorsal scapular nerve

Question 8

Motor innervation to serratus anterior muscle. Branches from root of C5-C7 in brachial plexus. Lies on the superficial aspect of the serratus anterior muscle.

Answer 8

long thoracic nerve

Question 9

Three trunks of the brachial plexus

Answer 9

Superior, middle, and inferior trunk

Question 10

Trunk of the brachial plexus. Formed by union of C5 and C6 roots

Answer 10

superior trunk

Question 11

Trunk of the brachial plexus. Formed by C7 root

Answer 11

middle trunk

Question 12

Trunk of the brachial plexus. Formed by union of C8 and T1 roots. Lies on rib 1 posterior to the subclavian artery

Answer 12

inferior trunk

Question 13

Branches directly from superior trunk of the brachial plexus (2)

Answer 13

Suprascapular nerve and nerve to subclavius

Question 14

Nerve to subclavius innervates…

Answer 14

subclavius muscle

Question 15

Suprascapular nerve innervates… (2)

Answer 15

supraspinatus and infraspinatus muscle (2/4 rotator cuff muscles)

Question 16

The suprascapular artery, which participates in shoulder anastomosis, is a branch of what vessel?

Answer 16

thyrocervical trunk

Question 17

Each of the 3 trunks of the brachial plexus divide into what?

Answer 17

Anterior and posterior divisions

Question 18

The 3 posterior divisions combine to form parts of the brachial plexus that give rise to nerves associated with….

Answer 18

posterior compartments of the upper limb

Question 19

The 3 anterior divisions form parts of the brachial plexus that ultimately give rise to peripheral nerves associated with…

Answer 19

the anterior compartments of the upper limb

Question 20

Brachial plexus cord posterior to the 2nd part of the axillary artery

Answer 20

posterior cord

Question 21

Brachial plexus cord medial to the 2nd part of the axillary artery

Answer 21

medial cord

Question 22

Brachial plexus cord lateral to the 2nd part of the axillary artery

Answer 22

lateral cord

Question 23

Origins of the posterior cord of the brachial plexus

Answer 23

all posterior divisions

Question 24

Origins of the lateral cord of the brachial plexus

Answer 24

anterior divisions from the superior and middle trunk

Question 25

Origins of the medial cord of the brachial plexus

Answer 25

anterior division of the inferior trunk

Question 26

Five nerves originating from the posterior cord of the brachial plexus

Answer 26

1) upper subscapular 2) thoracodorsal 3) lower subscapular 4) axillary nerve 5) radial nerve

Question 27

Side branches of the posterior cord (3)

Answer 27

1) upper subscapular nerve 2) thoracodorsal nerve 3) lower subscapular nerve

Question 28

Motor innervation of the subscapularis and teres major muscles

Answer 28

Lower subscapular nerve

Question 29

Motor innervation of the latissimus dorsi muscle

Answer 29

thoracodorsal nerve

Question 30

Motor innervation of the subscapularis muscle only

Answer 30

upper subscapular nerve

Question 31

Terminal branches of the posterior cord of brachial plexus (2)

Answer 31

Axillary and radial nerve

Question 32

Motor (2) and sensory (1) innervation of the axillary nerve

Answer 32

Motor: deltoid and teres minor muscle Sensory: skin of upper lateral arm

Question 33

Artery accompanying the axillary nerve

Answer 33

posterior circumflex humeral artery

Question 34

Motor (2) and sensory (4) innervation of the radial nerve

Answer 34

Motor: extensors of posterior arm and posterior forearm Sensory: skin of posterior arm, posterior forearm, dorsolateral hand, and proximal part of dorsum of lateral 3.5 digits

Question 35

Largest terminal branch of posterior cord

Answer 35

radial nerve

Question 36

Artery accompanying radial nerve

Answer 36

deep brachial artery

Question 37

Single side branch of the lateral cord of the brachial plexus

Answer 37

lateral pectoral nerve

Question 38

Motor innervation of lateral pectoral nerve

Answer 38

pectoralis major

Question 39

Side branches of the medial cord (3)

Answer 39

1) medial pectoral nerve 2) medial cutaneous nerve of the arm 3) medial cutaneous nerve of the forearm

Question 40

Lateral to the lateral pectoral nerve (named for the cord it branches from not its relation). Innervates the pectoralis major and minor muscles.

Answer 40

Medial pectoral nerve

Question 41

Cutaneous innervation of the medial distal 3rd of the arm. Communicates with intercostobrachial nerve of T2

Answer 41

Medial cutaneous nerve of the arm

Question 42

Cutaneous innervation to skin over biceps brachii muscle then down arm to supply skin of anterior/medial surface of forearm

Answer 42

medial cutaneous nerve of the forearm

Question 43

Terminal branches of lateral cord (2)

Answer 43

1) musculocutaneous nerve | 2) lateral part of median nerve

Question 44

Motor and sensory functions of musculocutaneous nerve

Answer 44

Motor: anterior arm muscles Sensory: lateral forearm

Question 45

What innervates all 3 flexor muscles in the anterior arm (coracobrachialis, biceps brachii, and brachialis)

Answer 45

musculocutaneous nerve

Question 46

Three flexor muscles in the anterior arm

Answer 46

coracobrachialis, biceps brachii, and brachialis

Question 47

What does the musculocutaneous nerve become in the forearm

Answer 47

lateral cutaneous nerve of the forearm

Question 48

Terminal branches of the medial cord of the brachial plexus (2)

Answer 48

median part of median nerve and ulnar nerve

Question 49

Motor innervation of ulnar nerve (2)

Answer 49

1) 1.5 muscles of anterior forearm | 2) most intrinsic muscles of the hand

Question 50

Sensory innervation of ulnar nerve (3)

Answer 50

1) medial 1/3 of palm 2) dorsal hand 3) medial 1.5 fingers (palmar and dorsal sides)

Question 51

Formed by a branch from the lateral cord and a branch from the medial cord (brachial plexus)

Answer 51

median nerve

Question 52

Motor innervation of median nerve (2)

Answer 52

1) most muscles of anterior forearm (except flexor carpi ulnaris is ulnar nerve) 2) some intrinsic muscles of hand (except medial half of the flexor digitorum profundus is ulnar nerve)

Question 53

Sensory innervation of median nerve (2)

Answer 53

1) lateral 2/3 of palm | 2) palmar side of lateral 3.5 fingers (+nail beds)