700 - muscles of proximal arm & muscle compartments

supinator origin

lateral epicondyle of humerus, radial collateral and annular ligament, supinator fossa, crest of ulna

pronator teres origin

medial epicondyle of humerus (via common flexor tendon)

pronator quadratus origin

distal quarter of anterior surface of ulna

anterior compartment consist of

biceps brachii

coracobrachialis

brachialis

posterior compartment consists of

triceps brachii

radial nerve

deep brachial artery and vein

biceps brachii action

shoulder and elbow flexion, supination

biceps brachii insertion

radial tuberosity on medial side of radius Bicep aponeurosis

bicep origin

(short head)- Coracoid process of scapula (long head)- Supraglenoid tubercle of scapula

coracobrachialis origin

Coracoid process of scapula

coracobrachialis action

shoulder adduction, shoulder flexion

coracobrachialis insertion

middle 1/3 of medial border of humerus

brachialis action

strong elbow flexion

brachialis origin

midshaft of humerus

brachialis insertion

coranoid process of ulna

transverse humeral ligament

keep long head of biceps in groove for greatest mechanical advantage

triceps action

elbow and shoulder extension

triceps origin

long head= infra-glenoid tubercle, lateral head proximal 2/3 humerus; medial head= distal 2/3 humerus on posterior side

triceps insertion

olecranon process

anconeus action

slight elbow extension, slight resist varus forces

anconeus origin

dorsal aspect of the lateral epicondyle of the humerus

anconeus insertion

olecranon of the ulna, along the proximal third of the posterior face of the ulna

pronator teres insertion

Lateral surface of proximal radius

pronator teres innervation

median nerve (C6, C7)

pronator teres action

pronates forearm and helps flex elbow

pronator quadratus insertion

distal quarter or anterior surface of radius

pronator quadratus innervation

median nerve anterior branch (C8, T1)

pronator quadratus action

pronates forearm

supinator insertion

Lateral, posterior, and anterior surfaces of proximal 1/3 of radius

supinator innervation

deep branch of radial nerve

supinator action

supinates forearm, rotates radius to turn palm anteriorly or superiorly if elbow is flexed