22 - Shoulder Joint - D3

22 Shoulder Joint - THE SHOULDER THE SHOULDER DONE BY DONE BY GHDER GHDER ALI NAMA ALI NAMA INTRODUCTION The part of the body where the humerus

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Unformatted text preview: THE SHOULDER THE SHOULDER DONE BY DONE BY : : GHDER GHDER ALI NAMA ALI NAMA INTRODUCTION The part of the body where the humerus attaches to the scapula. The shoulder must be mobile enough for the wide range actions of the arms and hands, but also stable enough to allow actions such as lifting, pushing and pulling. It is made up of three bones. Clavicle, Scapula Humerus . Joints of the shoulder: 1. Glenohumeral joint (main one, ball and socket joint, articulation between the glenoid fossa of the scapula (shoulder blade) and the head of the humerus 2. Acromioclavicular joint (articulation between the acromion process of the scapula and the lateral end of the clavicle ) 3. Sternoclavicular joint (articulation between sternal end of the clavicle , and the manubrium sterni There are two kinds of cartilage in the joint: 1. Articular cartilage : covers humerus head and glenoid surface. It’s a white cartilage which allows the bones to glide and move on each other. When this type of cartilage starts to wear out (a process called arthritis), the joint becomes painful and stiff. 2. Labrum : its a ring of rigid fibrous cartilage surrounding the glenoid cavity, it stabilizes the ball and socket joint! SHOULDER MOVEMENTS : It is the most mobile joint in the human body. The muscles and joints of the shoulder allow it to move through a remarkable range of motion , Arm abduction Arm adduction Arm flexion(90°) Arm extention(45°) Medial rotation of the arm (55°) Lateral rotation of the arm(40_45°) Arm circumduction (this is a combination of the above movement) ROTATOR CUFF MUSCLES...
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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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22 Shoulder Joint - THE SHOULDER THE SHOULDER DONE BY DONE BY GHDER GHDER ALI NAMA ALI NAMA INTRODUCTION The part of the body where the humerus

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