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Muscle: Triceps brachii (Musculus triceps brachii)
a. 3D Image of the muscle (in a new window).

Attachments: Origin & Insertion
Origin: (proximal attachment)
a.Infraglenoid tubercle of scapula.

Insertion: (distal attachment)
a. Posterior olecranon process of ulna.

Actions:
a. Extension of the arm at the shoulder (glenohumeral) joint.
b. (It also extends the forearm at the elbow joint).
c. Helps stablize the shoulder by drawing the humerus toward the glenoid fossa of the scapula.

Nerves & Nerve Roots:
a. Radial nerve.
a. C7, C8


















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Triceps Brachii (Long Head) Muscle