Starred Lecture Items L8 Flashcards
which scalene doesn’t attach to the first rib
posterior scalene
which scalenes does the brachial plexus go through
anterior and middle scalene
what are the contents of the quadrangular space
axillary nerve and posterior circumflex humeral artery/vein
what are the contents of the triangular space
circumflex scapular artery/vein
what are the contents of the triangular interval
deep brachial artery and radial nerve
what are the 5 terminal branches of the brachial plexus
musculocutaneous nerve, radial nerve, ulnar nerve, axillary nerve, median nerve
what is responsible for thoracic outlet syndrome
compression in the space between the clavicle and 1st rib, pec minor, or the presence of a cervical rib
what three muscles does the musculocutaneous nerve ennervate
biceps brachii
brachialis
coracobrachialis
(BBC)
what is biceps brachii main function (and other functions)
supination of forearm (main)
forearm flexion
resists shoulder dislocation (short head)
what three muscles attach to the coracoid process
biceps brachii (short head)
coracobrachialis
pectoralis minor
what nerve and spinal level enervates biceps brachii
musculocutaneous nerve (C5, C6**, C7); main= C6 bc myotome for elbow flexion
what nerve/spinal level enervates coracobrachialis
musculocutaneous nerve (C5,6*,7)
actions of corocobrachialis
flex and adduct the glenohumeral joint; resist shoulder dislocation
action of brachialis
elbow flexion
what muscle attaches to ulnar tuberosity and what attaches to radial tuberosity
brachialis= ulnar tuberosity
biceps brachii= radial tuberosity
what nerve and spinal level (and main) enervates the brachioradialis m
radial nerve C5,6,7
main= C6
where does the musculocutaneous nerve do motor innervation
all muscles of the anterior compartment of the upper arm
where does the musculocutaneous nerve do sensory innervation
skin of the lateral forearm
what is the only nerve that enervates the posterior arm
radial nerve
what spinal levels make up each of the terminal branches of the brachial plexus
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
what muscles make up the axilla wall (anterior, lateral, medial, posterior)
anterior wall: pectoralis major and minor
lateral wall: humerus
medial wall: serratus anterior, rib cage
posterior wall: latissimus dorsi, subscapularis, teres minor
if pec minor is in a diagram attached to a rib what rib can it be
rib 3-5
subclavius attaches to
first rib/costal cartilage
middle inferior clavicle
what nerve and spinal level (and main) is subclavius
subclavian nerve C5, C6 (main=C5)
subclavius action
depress/ anchor clavicle
biceps brachii attachment
short: coracoid process
long: supraglenoid tubercle (scapula)
radial tuberosity and forearm fascia (bicipital aponeurosis)
coracobrachialis attachments
coracoid process
middle of humerus
quadrangular space borders
teres minor, triceps brachii long head, teres major, humerus
triangular space borders
teres minor, teres major, triceps brachii long head
triangular interval borders
teres major, triceps brachii long head, humerus
where does the brachialis attach
bottom half of humerus and ulnar tuberosity/ulnar coronoid process
where does the brachioradialis attach
lateral supracondylar ridge of humerus and lateral distal radius (proximal to styloid process)
BOTTOM OF HUMERUS AND BOTTOM OF RADIUS
brachioradialis functions
flexes elbow (thumb up)
ASSISTS in pronation/supination
extensor compartment contents
triceps brachii
deep brachial artery
radial nerve (C5-T1)
triceps brachii attachments
long head: infraglenoid tubercle
lateral head: posterior humerus, SUPERIOR to radial groove
medial head: posterior humerus, inferior to radial groove
olecranon of ulna
triceps brachii nerve ennervation
radial nerve (C6, C7** , C8**)
which head of the triceps has a proximal attachment on superior/ inferior to the radial groove
lateral head: superior to radial groove
medial head: inferior to radial groove
