DELTOIDS - DELTS (SHOULDERS)

The deltoid moves and stabilizes the shoulder joint. The movements of the different deltoid parts can interact both synergistically and antagonistically depending on the specific part and the position of the humerus. The deltoid is the most important abductor of the shoulder joint. The abduction is mainly initiated and held by the acromial part. Both the clavicular and spinal parts function as adductors up to 60° and abductors over 60°. Furthermore the clavicular part causes an inward rotation and anteversion, the spinal part an outward rotation and retroversion.