Triceps brachii II muscles are pure elbow joint muscles. II muscles directly extend ulnas. During forearm accelerations, triceps brachii II muscles combine with medial epicondyle muscles to medially extend elbow joints. Elbow joint muscles master complicated force application patterns or suffer centrifugal acceleration injuries. Pitching Elbow Joint Actions 1.
Lateral flexions require humerus outward rotations and ulna flexions.
During upper arm accelerations, elbow joint muscles isoanglosly medially flex ulnas to fix elbow joint angles. Humeruses powerfully drive toward home plate. Medial flexions require humerus inward rotations and ulna flexions. During forearm accelerations, elbow joint muscles powerfully mioanglosly medially flex elbow joints. After humeruses start decelerating, ulnas start driving toward home plates.