The supraspinatus muscle is located in the supraspinous fossa of the scapula, forming part of the rotator cuff in the shoulder. It is a relatively small and triangular muscle that occupies the space above the spine of the scapula.
Originating from the supraspinous fossa of the scapula, the supraspinatus takes its starting point from the bony surface on the posterior aspect of the shoulder blade.
The muscle inserts into the greater tubercle of the humerus, forming a connection with the upper part of the arm bone.
Functionally, the supraspinatus is involved in initiating and assisting in the abduction of the arm at the shoulder joint. It plays a crucial role in the first 15 degrees of arm abduction, contributing to the overall range of motion in the shoulder. Additionally, the supraspinatus helps to stabilize the shoulder joint during arm movements, providing dynamic stability and preventing dislocation. The muscle is particularly active in activities such as lifting the arm overhead and reaching laterally, showcasing its significance in shoulder biomechanics and overall upper limb function.