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Shoulder Surface Anatomy
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| || The shoulder comprises the part of the body where the humerus attaches to the scapula and refers to the group of structures in the region of the joint. The articulations between the bones of the shoulder make up the shoulder joint. These three bones are: the clavicle (collarbone), the scapula (shoulder blade), and the humerus.|
The glenohumeral joint is the main joint of the shoulder. It is a ball and socket joint that allows the arm to rotate in a circular fashion or to hinge out and up, away from the body. It is formed by the articulation between the head of the humerus and the lateral scapula
The main superficial muscles around the shoulder are the deltiod group, rotator cuff and pectoralis major muscles.
The rotator cuff is an anatomical term given to the group of muscles and their tendons that act to stabilize the shoulder, the muscles are Supraspinatus, Infraspinatus, Teres minor and the Subscapularis.
The pectoralis major muscle is a thick, fan-shaped muscle, situated at the upper anterior of the chest wall. It makes up the bulk of the chest muscles in the male and lies under the breast in the female.
The deltoid muscle group has three sets of fibres anterior, middle and posterior they act to both abduct the arm and stabilise the dhoulder joint.
| || The clavicle is a long bone that makes up part of the shoulder girdle. It acts as a shunt to keep the scapula in position so the arm can hang freely. Medially it articulates with the manubrium of the sternum at the sternoclavicular joint. At its lateral end it articulates with the acromion of the scapula at the acromioclavicular joint.|
The entire region is prone to injury and good knowledge of this area will help the radiographer decide which views will demonstrate the injury the best ie Shoulder views, Clavicle views, AC joint or SC joints.
| || The scapula forms the posterior part of the shoulder girdle, it is a flat bone, roughly triangular in shape,placed on a posterolateral aspect of the thoracic cage.|
The medial border of the scapula is a commonly used landmark for performing lateral shoulder and scapula views.
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Latest page update: made by AndyC
, Mar 17 2008, 7:59 AM EDT
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Keyword tags: AC joint Clavicle Deltoid Glenohumeral Joint Jugular Notch Pectroalis Major SC Joint Scapula Shoulder Joint Surface Anatomy Shoulder
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