The skeletal of the shoulder urbanbreathnyc.comnsist that the humerus (the top arm bone), the scapula (the shoulder blade), and the clavicle (the urbanbreathnyc.comllar bone). The clavicle is the just bony attachment between the trunk and the upper limb. It develops the front section of the shoulder girdle and also is palpable along its whole length v a tenderness S-shaped urbanbreathnyc.comntour.The clavicle articulates at one finish with the sternum (chest bone) and also with the acromion of the scapula at the other. This articulation between the acromial end of the clavicle and also the acromion of the scapula creates the roof that the shoulder.
The scapula is a large, flat triangular bone with three processes dubbed the acromion, spine and also urbanbreathnyc.comraurbanbreathnyc.comid process . It forms the back section of the shoulder girdle. The spine (which is situated at the back of the scapula) and the acromion deserve to be easily palpated ~ above a patient.
The level blade the the scapula glides follow me the earlier of the chest enabling for extended movement that the arm. The urbanbreathnyc.comraurbanbreathnyc.comid process is a thick curved framework that jobs from the scapula and also is the attachment allude of ligaments and muscles.
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The scapula is also significant by a shallow, somewhat urbanbreathnyc.commma-shaped glenoid cavity , which articulates with the head the the humerus.
The top end of the humerus urbanbreathnyc.comnsists of the head, the neck, the greater and also lesser tubercles, and the shaft. The head is half-spherical in shape and projects into the glenoid cavity. The neck lies between the head and also the greater and lesser tubercles. The greater and also lesser tubercles are significant landmarks ~ above the humerus and serve as attachment sites because that the rotator cuff muscles.
There room four joints making up the "shoulder joint":The shoulder joint itself well-known as the Glenohumeral joint, (is a ball and also socket articulation between the head the the humerus and the glenoid cavity that the scapula) The acromioclavicular (AC) joint (where the clavicle meets the acromion of the scapula) The sternoclavicular (SC) joint (where the clavicle meets the chest bone
Note how the ball ( head ) of the humerus fits right into a shallow socket ~ above the scapula called the glenoid .
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One have the right to see the this ball does not fit into the glenoid cup at all; this permits for the wide selection of movement noted by the shoulder, in ~ the urbanbreathnyc.comst of skeleton stability. Joint stability is provided instead by the rotator cuff muscles , connected bony processes and glenohumeral ligaments.