where does triceps originate
Triceps Brachii Muscle (Lateral Head). The lateral head of the triceps brachii muscle is a muscle of the back of the arm, originating from the back of the humeral shaft and inserting at the elbow.The triceps brachii has three heads (connective immovable muscle) and is the only muscle on the back of the upper arm.lick to read more below. The lateral head of the triceps brachii muscle is a muscle of the back of the arm, originating from the back of the humeral shaft and inserting at the elbow.