OT 531 Musculoskeletal Anatomy (Brachium)

What are the bones of the brachium?

humerus and bones attaching (scapula, ulna, radius)

what are the compartments of the brachium?

separated into two fascial compartments:

2. flexor compartment

3. extensor compartment

flexor compartment is innervated by

musculocutaneous nerve

extensor compartment is innervated by

radial nerve

what are the superficial veins in the brachium?

cephalic and basilic

what are the two fascial compartments of the brachium?

1. one contains flexors of shoulder and elbow joints (musculocutaneous nerve)

2. other contains extensors of elbow joint (radial nerve)

contents of flexor compartment of the brachium

muscles

coracobrachialis

biceps brachii

brachialis

brachial artery & vein

nerves

median nerve

ulnar nerve

musculocutaneous nerve

what does the axillary artery become the brachial artery?

after inferior border of teres major

short head of the biceps brachii assists with....

resisting shoulder dislocation

what muscle flexes elbow no matter what position its in

brachialis m.

which muscles cross elbow joint?

brachialis m. and biceps brachii m.

which muscle crosses shoulder joint?

coracobrachialis m.

actions of the biceps brachii?

supination, when forearm is supinated it flexes

cephalic vein is lateral to

biceps brachii

basilic vein is median side of

biceps brachii

contents of extensor compartment of brachium

muscles

triceps brachii

anconeus

deep brachial artery

radial nerve

where is the medial head of triceps brachii located?

same spot as brachialis

action of anconeus muscle

extends elbow

biceps brachii muscle (attachments, innervation, actions)

proximal attachment:

short head- coracoid process of scapula

long head- supraglenoid tubercle of scapula

distal attachment:

tuberosity of radius and fascia of forearm via bicipital aponeurosis

innervation

musculocutaneous nerve

actions

supination of forearm, when forearm is supinated it flexes elbow joint

flexes shoulder joint

short head resists dislocation of the shoulder

brachialis muscle (attachments, innervation, actions)

proximal attachment:

distal half of anterior humerus

distal attachment:

coronoid process and tuberosity of ulna

innervation

musculocutaneous nerve

actions

flexes elbow at joint in all positions

coracobrachialis muscle (attachments, innervation, actions)

proximal attachment:

coracoid process of scapula

distal attachment:

medial surface of humerus

innervation

musculocutaneous nerve

actions

helps flex and adduct shoulder joint

resists dislocation of shoulder

triceps brachii muscle (attachments, innervation, actions)

proximal attachment:

long head- infraglenoid tubercle of scapula

lateral head- posterior surface of humerus, superior to radial groove

medial head- posterior surface of humerus, inferior to radial groove

distal attachment:

olecranon of ulna and fascia of forearm

innervation

radial nerve

actions

extensor of elbow joint

long head- extends shoulder joint and resists dislocation of humerus

anconeus muscle (attachments, innervation, actions)

proximal attachment:

lateral epicondyle of humerus

distal attachment:

olecranon of ulna

innervation

radial nerve

actions

assists triceps in extending elbow joint

stabilizes elbow joint

abducts ulna during pronation