Shoulder Anatomy

Shoulder Anatomy


Radiotherapy course because of proximity to the anatomy of the shoulder joint needs to be reviewed briefly.


Attending Bones Shoulder Joint Structure


a) The scapula: glenoid fossa with the head of the humerus; clavicle and shoulder joint by joint and creates.


b) Proximal humerus: the humeral head articular, the anatomic neck, the tendons of the rotator cuff and biceps muscle adheres large and small tubercles composed of long head tendon passes furrow.


c) Clavicle: the outside part of the scapula with acromio clavicular joint by axial and appendicular skeleton accretion connects.


Attending the shoulder joint and Ligaments Structure


a) SCJ: sternoclavicular joint located between the proximal part of the clavicle with Manibrium Sterne, shoulder strap connects the thorax and upper extremity.


b) Acromioclavicular joint: a small oval face medial facet and a facet joint between the clavicle on the same. Acromioclavicular joint stability during movement of the arm is supported by ligaments.


c) Glenohumeral joint: The humeral head and glenoid fossa between. Joint, flexion, extension, abduction, adduction, medial rotation, lateral rotation is doing the movements. Passive stability of the joint (glenohumeral ligaments, glenoid labrum, capsule, bone structures) and active mechanisms (the rotator cuff muscles, long head of biceps muscle and tendon) play a role.


d) the glenoid labrum: glenoid fossa, and vascularity of the edge of the adhesive, a little fibrous tissue is formed. Articular surface of the glenohumeral ligaments and next to expand and deepen the shoulder joint to increase stability for the long head biceps tendon adhesion creates a zone.


Attending Structure Shoulder Muscles


a) The rotator cuff muscles: subscapularis, and sticking a small tubercle in order from top to bottom with large tubercle-adhesive supraspinatus, infraspinatus and teres minor muscles occurs. Supraspinatus are involved in shoulder abduction. Infraspinatus and minor external rotation of the shoulder allows. At the same time contributing to the minor and infraspinatus function acts as a weak adductor. Powerful adductor and internal subscapularis.


b) Biceps muscle: biceps muscle function and stabilization of the joint contributes. Tuberculum majus and minus ligament lies between the synovial sheath of biceps long head and external boundaries. Centralization and stabilizes the glenohumeral joint.


Around the Shoulder Joint


Ranges formed by the merger facial. Normally surfaces to be slippery, especially among hard tissues, for example, the tendon-bone, skin, bone and tendons often are among the adhesion in muscle and bone. Connected or disconnected with the joint near the shoulder joint.

Coracoacromial ligament and subacromial extending below the shoulder joint is the most important neighbor. This grant is divided into the joint cavity with the rotator cuff. Rotator cuff and coracoacromial arch structure as a function of lubricant between the acts.


Subscapular bursa, joint capsule is an extension of the normal. Facilitates the movement of subscapular tendon.


They protrude out of the subscapular tendon separates, infraspinatus tendon, joint capsule and separating the infraspinatus and skin are separates