The deep fibers of its lower part can create a variation known as the subanconeus. One of its portions arises from a linear roughening above the spiral groove, while its longest portion takes origin from the infraglenoid tubercle. All of its portions form a flat tendon that inserts onto the posterior surface of the olecranon. It is innervated by the radial nerve and it is the chief extensor of the forearm at the elbow joi
The deep fibers of its lower part can create a variation known as the subanconeus. One of its portions arises from a linear roughening above the spiral groove, while its longest portion takes origin from the infraglenoid tubercle. All of its portions form a flat tendon that inserts onto the posterior surface of the olecranon. It is innervated by the radial nerve and it is the chief extensor of the forearm at the elbow joint. For 10 points, name this muscle in the posterior compartment of the upper arm that derives its name from its three heads.
The deep fibers of its lower part can create a variation known as the subanconeus.
{triceps} brachii