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As rotator cuff defined as a functionally important group of muscles of the shoulder, on the shoulder blade (scapula) has its origins were held as a cuff around the humeral head sets and for the rotation and elevation of the arm is partly responsible.

A distinction in the rotator cuff

• subscapularis
• supraspinatus
• the infraspinatus
• musculus teres minor.

The subscapularis muscle arises from the front of the scapula (subscapular fossa of the scapula) and is on the front of the humeral head (lesser tuberosity) to. He clamped on, the upper arm rotated inward (strongest arm - inner Dreher) and used to the body (adduction).

The supraspinatus originates on the upper portion the rear surface of the scapula (supraspinatus fossa of the scapula) and draws under the acromion through (tuberculum majus) to the lateral humeral head . His role is that of lateral arm lift, especially in the initial phase of the movement in the body adjacent Poor. Less he appears regularly at the external rotation of the arm.

The infraspinatus muscle originates at lower part of the back surface of scapula (infraspinatus fossa of the scapula) and draws also on the greater tuberosity of the humeral head, a little behind the supraspinatus . He is the most powerful external rotator of the arm.

The teres minor has its origin in the margin of the scapula (Margo lateraris the scapula). He also draws on the tuberculum majus. Functionally, it is a weak external rotator of the Upper arm. He also is involved in pulling the upper arm to the body.

diseases

Unlike other large joints of the body is the shoulder joint is mainly carried out by its soft tissues (muscles, ligaments, joint capsule) and stabilized. The contact of the large humeral head (humerus) to the shoulder socket (glenoid) is small. Because of this intense pressure to find disease is more common in the area of the shoulder joint, the rotator cuff.

is often particularly affected the musculus supraspinatus under the roof of the shoulder through the humeral head moves. In the horizontal arm movements, there is a narrow shoulder cap for this muscle, because the humeral head during arm lift rises up under the acromion. Through the system must have acquired or due to wear shoulder roof frames can cause the symptoms of impingement syndrome . What it means is the repeated pinching of the supraspinatus tendon under the acromion, resulting in inflammation of the tendon and found there bursa (subacromial bursitis ) has resulted. If the carrying capacity of the supraspinatus tendon triggered, they can break without adequate injury ( Supraspinatussehnenruptur).

by a chronic injury may also lime deposit in the supraspinatus tendon, but also in other tendons of the rotator cuff. This is called the disease a tendinitis calcarea .