Triceps Brachii-Lateral Head

thumb-muscles-labeledMuscle Origin

Posterior Humerus above the radial groove to the olecranon process of ulna.

Lateral head: above the radial sulcus. Superior half of the posterior surface of the humeral shaft, lateral to the spiral groove


Posterior surface of the olecranon process of the ulna.


Extends elbow.

The Triceps function with forearm flexion (bicep curl), forearm supination (turning the palm of the hand up), and upper arm flexion (raising the arm forward and upward). It is most effective as a forearm flexor when the forearm is supinated.

Innervation – Nerve control

Radial nerve (C6,7)

The radial nerve originates from the brachial plexus, carrying fibers from the ventral roots of spinal nerves C5, C6, C7, C8 & T1.


Brachial artery.

Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery. The brachial artery is the major blood vessel of the (upper) arm. It is the continuation of the axillary artery beyond the lower margin of teres major muscle. Wiki

Antagonist muscles

Deltoid (anterior part), Coracobrachialis, Biceps Brachii, Pectoralis Major (clavicular head); Supraspinatus, Deltoid (middle part); Brachialis, Biceps brachii, Brachioradialis.

Pictures of muscles


Trigger Point Referrals


Stretching description








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