biceps brachii, brachialis, coracobrachialis, triceps brachii

Brachialis

Mostly deep muscle to biceps brachii

flexion of forearm at elbow. supination of forearm at radioulnar

biceps brachii actions

radial tuberosity. bicipital aponeurosis

biceps brachii insertion

supraglenoid tubercle of scapula

biceps brachii origin (long head)

coracoid process

biceps brachii origin (short head)

flexion of forearm at elbow

brachialis action

coronoid process of ulna

brachialis insertion

distal half of anterior shaft of humerus

brachialis origin

flexion and adduction of arm at shoulder

coracobrachialis actions

middle medial portion shaft of humerus

coracobrachialis insertion

coracoid process

coracobrachialis origin

triceps brachii

superficial muscle of posterior arm

biceps brachii

superficial muscle of the anterior

extension of forearm at elbow

triceps brachii action

olecranon process of ulna

triceps brachii insertion

humeral shaft

triceps brachii origin (lateral & medial head)

infraglenoid tubercle of scapula

triceps brachii origin (long head)

lateral head

whichhead of triceps brachii origin is more proximal on humerus?