ARM

Epitrochlearis

O: Latissimus dorsi
I: Olecranon
A: Extend the forearm (with the triceps); rotate the ulna

Triceps brachii long head

O: Glenoid border of the scapula
I: Olecranon process of the ulna
A: Extend the forearm

Triceps brachii lateral head

O: Greater tuberosity and deltoid ridge of the humerus
I: Olecranon process of the ulna
A: Extend the forearm

triceps brachii (medial head)

O: dorsal surface of the humerus
I: Olecranon process of the ulna
A: Extend the forearm

Biceps brachii

O: Supraglenoid tubercle of the scapula
I: Bicipital tuberosity of the radius
A: Flex forearm; assist in supination of the forearm

deltoid

O: scapula
I: deltoid ridge
A: adducts and protracts the humerus

brachialis

O: lateral surface of the humerus
I: ulna
A: with the biceps, flexes forearm