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
Long head – originates from the infraglenoid tubercle
Medial head – originates from thehumerus, inferior to the radial groove
Lateral head – originates from the humerus, superior to the radial groove
Distally, the heads converge onto one tendon and insert into the olecranon of theulna.
Actions of the triceps brachii muscle
Extension of the arm at the elbow
Nerve supply of the triceps brachii muscle
Radial nerve. A tap on the triceps tendon tests spinal segment C7.
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