poikkihartialihaksia

Poikkihartialihaksia, also known as the supraspinatus and infraspinatus muscles, are key components of the rotator cuff in the shoulder. The supraspinatus originates from the supraspinous fossa of the scapula and inserts onto the greater tubercle of the humerus. Its primary action is the initiation of arm abduction, meaning it helps lift the arm away from the body.

The infraspinatus originates from the infraspinous fossa of the scapula and also inserts onto the greater tubercle of the humerus, just below the supraspinatus insertion. This muscle is primarily responsible for external rotation of the arm. Both muscles work together with the teres minor and subscapularis muscles to stabilize the glenohumeral joint, which is the main ball-and-socket joint of the shoulder.

Dysfunction or injury to the poikkihartialihaksia, particularly the supraspinatus, is a common cause of shoulder pain and impingement syndrome. Tears in these tendons can occur due to overuse, trauma, or age-related degeneration. Rehabilitation often involves strengthening exercises for these muscles to improve function and reduce pain. Their role in overhead activities and daily arm movements makes them crucial for shoulder health and mobility.