Axilla & Brachial Plexus

Question 1

order of hierarchy of brachial plexus? where does each emerge? how many of each?

Answer 1

“Read The Damn Cadaver Book” Rami- upper neck Trunks- lower neck Divisions- behind clavicle Cords- in axilla Branches- upper arm 5 on ends (5 roots, 5 branches) 3-6-3 in between (3 trunks, 6 divisions, 3 cords)

Question 1

formed from posterior cord, circles behind humerus in the quadrangular space

Answer 1

axillary nerve

Question 1

innervates subclavius muscle

Answer 1

nerve to subclavius

Question 2

brachialis is innervated 1/2 by ___ & 1/2 by ___

Answer 2

musculocutaneous

radial

Question 3

anterior wall of axilla

Answer 3

pec major & minor

Question 3

the brachial plexus is composed of ventral rami of…

Answer 3

C5-T1

Question 4

innervates subscapularis & teres major

Answer 4

lower subscapular nerve

Question 5

what does ulnar nerve innervate?

Answer 5

most of hand muscles

flexor carpi ulnaris

1/2 flexor digitorum profundus

Question 5

innervates rhomboids & levator scapulae

Answer 5

dorsal scapular nerve

Question 7

lateral wall of axilla

Answer 7

bicipital groove of humerus

Question 8

what is formed by the lateral cord?

Answer 8

musculocutaneous nerve

Question 8

“major nerve” of the anterior arm

Answer 8

musculocutaneous nerve

Question 8

what does radial nerve innervate?

Answer 8

muscles of posterior arm & forearm and 1/2 brachialis

Question 9

Identify.

Answer 9

Ulnar nerve

Question 10

posterior wall of axilla

Answer 10

latissimus dorsi, teres major, subscapularis

Question 10

5 groups of lymphatics in axilla

Answer 10

pectoral, subscapular, humeral, central, apical

Question 11

pyramidal shaped region between arm & chest

Answer 11

axilla

Question 11

innervates supraspinatus & infraspinatus

Answer 11

suprascapular nerve

Question 13

base of axilla

Answer 13

skin/fascia of armpit

Question 14

provides sensory innervation to medial arm

Answer 14

medial brachial cutaneous n

Question 15

what does axillary nerve innervate?

Answer 15

deltoid & teres minor

Question 16

innervates latissimus dorsi

Answer 16

thoracodorsal nerve

Question 17

innervates subscapularis muscle

Answer 17

upper & lower subscapular nerves

Question 18

these nodes drain the posterior thoracic wall & scapular region

Answer 18

subscapular

Question 19

provides sensory innervation to medial forearm

Answer 19

medial antebrachial cutaneous n

Question 20

sensory innervation to lateral arm? pad of thumb? index finger? little finger?

Answer 20

C5 C6 C7 C8

Question 20

which cranial nerves emerge above their respective vertebrae?

Answer 20

C1-C7

Question 20

innervates both pectoralis minor & major

Answer 20

medial pectoral nerve

Question 21

Identify 1-2.

Answer 21

1. Coracobrachialis 2. Musculocutaneous nerve

Question 22

Identify.

Answer 22

Radial nerve

Question 23

where does C8 spinal nerve emerge?

Answer 23

below C7 vertebra

Question 24

innervates pectoralis major (only)

Answer 24

lateral pectoral nerve

Question 26

these nodes drain the upper limb except for the portion along the cephalic vein

Answer 26

humeral

Question 27

Identify.

Answer 27

Axillary nerve

Question 29

these nodes drain all other nodes in the axilla

Answer 29

apical

Question 30

innervates serratus anterior

Answer 30

long thoracic nerve

Question 32

this nerve is formed by 1/2 of lateral cord and 1/2 of medial cord

Answer 32

medial nerve

Question 34

"major nerve" of anterior forearm

Answer 34

median nerve

Question 36

medial wall of axilla

Answer 36

serratus anterior

Question 38

these nodes drain the anterior thoracic wall & most of breast

Answer 38

pectoral

Question 40

what does musculocutaneous innervate?

Answer 40

coracobrachialis, biceps brachii, 1/2 brachialis

Question 42

these nodes drain from pectoral, subscapular, humeral nodes to the apical nodes

Answer 42

central

Question 43

Identify.

Answer 43

radial nerve

Question 44

what nerve innervates most of anterior forearm?

Answer 44

median nerve

Question 45

Identify.

Answer 45

Median nerve

Question 46

this nerve is formed from the medial cord, runs behind the medial epicondyle

Answer 46

ulnar nerve

Question 47

"major nerve" of the hand

Answer 47

ulnar nerve

Question 48

formed from posterior cord, passes in radial groove & is in triangular interval

Answer 48

radial nerve

Question 49

what muscle does musculocutaneous pass through?

Answer 49

coracobrachialis