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Muscle: Triceps brachii - long head (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. Extends the arm at the shoulder (glenohumeral) joint.
b. (Also extends the forearm at the elbow joint).

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


















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Triceps Brachii (Long Head) Muscle