Starred Lecture Items L8

Question 1

which scalene doesn’t attach to the first rib

Answer 1

posterior scalene

Question 2

which scalenes does the brachial plexus go through

Answer 2

anterior and middle scalene

Question 3

what are the contents of the quadrangular space

Answer 3

axillary nerve and posterior circumflex humeral artery/vein

Question 4

what are the contents of the triangular space

Answer 4

circumflex scapular artery/vein

Question 5

what are the contents of the triangular interval

Answer 5

profunda brachii artery (or deep brachial artery) and radial nerve

Question 6

what are the 5 terminal branches of the brachial plexus

Answer 6

musculocutaneous nerve, radial nerve, ulnar nerve, axillary nerve, median nerve

Question 7

what is responsible for thoracic outlet syndrome

Answer 7

compression in the space between the clavicle and 1st rib, pec minor, or the presence of a cervical rib

Question 8

what three muscles does the musculocutaneous nerve ennervate

Answer 8

biceps brachii
brachialis
coracobrachialis
(BBC)

Question 9

what is biceps brachii main function (and other functions)

Answer 9

supination of forearm (main)
forearm flexion
resists shoulder dislocation (short head)

Question 10

what three muscles attach to the coracoid process

Answer 10

biceps brachii (short head)
coracobrachialis
pectoralis minor

Question 11

what nerve and spinal level/main spinal level enervates biceps brachii

Answer 11

musculocutaneous nerve (C5, C6, C7); main= C6 bc myotome for elbow flexion

Question 12

what nerve/spinal level/main spinal level enervates coracobrachialis

Answer 12

musculocutaneous nerve (C5,6,7); main= C6

Question 13

actions of corocobrachialis

Answer 13

flex and adduct the glenohumeral joint; resist shoulder dislocation

Question 14

action of brachialis

Answer 14

elbow flexion

Question 15

what muscle attaches to ulnar tuberosity and what attaches to radial tuberosity

Answer 15

brachialis= ulnar tuberosity
biceps brachii= radial tuberosity

Question 16

what nerve and spinal level (and main) enervates the brachioradialis m

Answer 16

radial nerve C5,6,7
main= C6

Question 17

where does the musculocutaneous nerve do motor innervation

Answer 17

all muscles of the anterior compartment of the upper arm

Question 18

where does the musculocutaneous nerve do sensory innervation

Answer 18

skin of the lateral forearm

Question 19

what is the only nerve that enervates the posterior arm

Answer 19

radial nerve

Question 20

what spinal levels make up each of the terminal branches of the brachial plexus

Answer 20

radial n: C5,6,7,8 T1
median n: C5,6,7,8 T1
musculocutaneous: C5,6,7
ulnar n: C7,8 T1
axillary n: C5,6

Question 21

what muscles make up the axilla wall (anterior, lateral, medial, posterior)

Answer 21

anterior wall: pectoralis major and minor
lateral wall: humerus
medial wall: serratus anterior, rib cage
posterior wall: latissimus dorsi, subscapularis, teres minor

Question 22

if pec minor is in a diagram attached to a rib what rib can it be

Answer 22

rib 3-5

Question 23

subclavius attaches to

Answer 23

first rib/costal cartilage
middle inferior surface of clavicle

Question 24

what nerve and spinal level (and main) is subclavius

Answer 24

subclavian nerve C5, C6 (main=C5)

Question 25

subclavius action

Answer 25

depress/ anchor clavicle

Question 26

biceps brachii attachment

Answer 26

short: coracoid process
long: supraglenoid tubercle (scapula)

radial tuberosity and forearm fascia (bicipital aponeurosis)

Question 27

coracobrachialis attachments

Answer 27

coracoid process
middle of humerus

Question 28

quadrangular space borders

Answer 28

teres minor, triceps brachii long head, teres major, humerus

Question 29

triangular space borders

Answer 29

teres minor, teres major, triceps brachii long head

Question 30

triangular interval borders

Answer 30

teres major, triceps brachii long head, triceps brachii lateral head

Question 31

where does the brachialis attach

Answer 31

bottom half of humerus and ulnar tuberosity/ulnar coronoid process

Question 32

where does the brachioradialis attach

Answer 32

lateral supracondylar ridge of humerus and lateral distal radius (proximal to styloid process)
BOTTOM OF HUMERUS AND BOTTOM OF RADIUS

Question 33

brachioradialis functions

Answer 33

flexes elbow (thumb up)

ASSISTS in pronation/supination