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Triceps Brachii: Origin, Insertion, Nerve Supply & Action

The triceps brachii muscle “three-headed muscle of the arm” is the large muscle on the Posterior Compartment of the upper limb. Triceps Brachii muscle is principally responsible for extension of the elbow joint.

Attachments of the triceps brachii muscle

Origin:
Long head – originates from the infraglenoid tubercle
Medial head – originates from the humerus, inferior to the radial groove
Lateral head – originates from the humerus, superior to the radial groove

Insertion:
Distally, the heads converge onto one tendon and insert into the olecranon of the ulna.

Actions of the triceps brachii muscle

Extension of the arm at the elbow

triceps muscle

Nerve supply of the triceps brachii muscle

Radial nerve. A tap on the triceps tendon tests spinal segment C7.

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