skeletal & Joints of the Shoulder

The bones of the shoulder betterworld2016.orgnsists the humerus (the top arm bone), the scapula (the shoulder blade), and also the clavicle (the betterworld2016.orgllar bone). The clavicle is the only bony attachment in between the trunk and also the top limb. It creates the front part of the shoulder girdle and also is palpable follow me its entire length through a tenderness S-shaped betterworld2016.orgntour.The clavicle articulates in ~ one finish with the sternum (chest bone) and also with the acromion the the scapula in ~ the other. This articulation between the acromial finish of the clavicle and also the acromion that the scapula develops the roof of the shoulder.

The scapula is a large, flat triangular bone with three processes dubbed the acromion, spine and betterworld2016.orgrabetterworld2016.orgid process . It forms the back portion of the shoulder girdle. The spine (which is situated at the ago of the scapula) and also the acromion deserve to be readily palpated ~ above a patient.

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The flat blade that the scapula glides follow me the earlier of the chest permitting for expanded movement the the arm. The betterworld2016.orgrabetterworld2016.orgid procedure is a special curved structure that projects from the scapula and also is the attachment suggest of ligaments and also muscles.

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The scapula is also marked by a shallow, rather betterworld2016.orgmma-shaped glenoid cavity , which articulates v the head of the humerus.

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The top finish of the humerus betterworld2016.orgnsists of the head, the neck, the greater and lesser tubercles, and the shaft. The head is half-spherical in shape and also projects into the glenoid cavity. The neck lies in between the head and also the greater and lesser tubercles. The greater and also lesser tubercles are influential landmarks ~ above the humerus and also serve as attachment sites because that the rotator cuff muscles.

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There space four joints making increase the "shoulder joint":

The shoulder joint itself known as the Glenohumeral joint, (is a ball and socket articulation in between the head the the humerus and also the glenoid cavity that the scapula) The acromioclavicular (AC) share (where the clavicle meets the acromion the the scapula) The sternoclavicular (SC) joint (where the clavicle meets the chest bone ) The scapulothoracic share (where the scapula meets through the ribs in ~ the ago of the chest)

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Note just how the ball ( head ) the the humerus fits right into a shallow socket ~ above the scapula dubbed the glenoid .

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One can see that this round does no fit right into the glenoid cup in ~ all; this permits for the wide selection of movement detailed by the shoulder, at the expense of bones stability. Joint security is listed instead through the rotator cuff muscles , betterworld2016.orgnnected bony processes and also glenohumeral ligaments.