Triceps+Brachii

Origin
3 Heads: Long Head: Infraglenoid Tubercle of the Scapula Lateral Head:Superior 1/2 of the posterior lateral humerus Medial Head:Inferior 2/3 of the posterior humerus

Insertion
Olecranon Process of the Ulna

Action
Extension of the forearm Long Head: extension and adduction of the arm

Innervation
Radial Nerve