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22 - Shoulder Joint - D3

22 - Shoulder Joint - D3 - THESHOULDER THESHOULDER DONEBY...

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THE SHOULDER THE SHOULDER DONE BY DONE BY GHDER  GHDER  ALI NAMA ALI NAMA
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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 .
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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!
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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)
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