Shoulder Joint Kinesiological Joint Actions Humeral movements define shoulder joint kinesiological actions. Humeruses move forward and backward, up from and down to sides, forward and backward from shoulder high positions and rotate inwardly and outwardly. Abductions occur when shoulder joint muscles contract to laterally move humeruses upward from side positions. Adductions occur when shoulder joint muscles contract to medially move humeruses downward to side positions from shoulder high positions. Extensions occur when shoulder joint muscles contract to posteriorly move humeruses.
Flexions occur when shoulder joint muscles contract to anteriorly move humeruses.
Horizontal Extensions occur when shoulder joint muscles contract to posteriorly move abducted humeruses. Horizontal Flexions occur when shoulder joint muscles contract to anteriorly move abducted humeruses. Inward Rotations occur when shoulder joint muscles contract to inwardly rotate humeruses. Outward Rotations occur when shoulder joint muscles contract to outwardly rotate humeruses. Shoulder Joint Muscles Shoulder joint muscles attach to humeruses from scapulas, clavicles or thoraxes.