Shoulder: It is the part of the body where the arm meets the torso .


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  • 1 Constitution of the shoulder joint
  • 2 Classification of the joint
  • 3 Shoulder muscles
  • 4 Shoulder injuries and diseases
  • 5 Sources

Constitution of the shoulder joint

It joins the humerus and through it the entire free portion of the upper limb, particularly the scapula.
It is made up of three bones: the clavicle , the scapula and the humerus

Joint classification

  • It is a synovial joint: the main means of union is the joint capsule.
  • It is a simple joint: it has two articular faces.
  • According to the shape of the spheroidal articular faces.
  • Taking into account the polyaxyl movements: it moves around the frontal axis, the sagittal axis and the vertical axis.

Shoulder muscles

  • The supraspinatus muscle, which allows the shoulder to be raised.
  • The subscapularis muscle, which allows the shoulder to be rotated internally.
  • The infraspinatus muscle, which allows external rotation.
  • The minor round muscle, which allows external rotation.
  • The major round muscleallows internal rotation.

Shoulder injuries and illnesses

  • Bursitis:The muscles of the rotator pass under the calvicula (neck bone) and the acromion (top of the shoulder blade) reach the head of the humerus. The subacromial pouch, an area of ​​fluid, protects these muscles against the bones that are above them. When this pouch becomes inflamed it is called “bursitis.” This can cause significant pain in the shoulder as well as down the side of the upper arm.
  • Tendonitis:If it is the same tendon that becomes inflamed it is called rotary tendonitis
  • Shocksyndrome : Shock syndrome occurs when the pouch and tendons become inflamed. The collision or pinch occurs against the bone that covers the rotary (acromion). A projection on the acromion or excessive thickening or curvature can rub the tendon causing a shock. If this friction continues for a long period of time, the rotary tendons are at risk of breaking or disconnecting from the flue.
  • Arthritis:Common AC arthritis is caused by painful joint degeneration. Symptoms may include tenderness directly above the joint and pain when moving the arm through the body to the opposite side of the shoulder or a lump in the joint.


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