Each shoulder has four main tendons.
These four tendons are crucial components of the rotator cuff, a group of muscles and tendons that surround the shoulder joint, providing stability and a wide range of motion. These tendons connect the rotator cuff muscles to the humerus (upper arm bone).
Here's a breakdown of the four main tendons in each shoulder:
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Supraspinatus: This is the most commonly injured rotator cuff tendon. It helps with lifting the arm away from the body (abduction).
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Infraspinatus: This tendon assists in externally rotating the arm.
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Teres Minor: Also helps with external rotation and assists in adduction (bringing the arm towards the body).
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Subscapularis: This tendon is located on the front of the shoulder and is responsible for internal rotation of the arm.
These tendons work together to allow for a full range of motion in the shoulder and are essential for activities like reaching, throwing, and lifting. Injuries to these tendons, such as tears or tendinitis, can cause pain, weakness, and limited range of motion.
