Deltoid Abduction of the shoulder (moving the arm outwards and away from the body) Outward arm action in a jumping jack Rotator cuffs A group of stabilising muscles of the shoulder which helps to ...

There are several muscles of different shapes and sizes in the upper back, which help with neck, shoulder, and arm movements. Injuries to these muscles can cause upper back pain. The feeling can ...

The rotator cuff consist of four muscles within the shoulder, connecting the upper arm (humerus) to the shoulder blade (scapula). The rotator cuff provides stability for the shoulder joint and is ...