The skeletal of the shoulder 4476mountvernon.comnsist the the humerus (the upper arm bone), the scapula (the shoulder blade), and the clavicle (the 4476mountvernon.comllar bone). The clavicle is the only bony attachment between the trunk and the upper limb. It develops the front part of the shoulder girdle and also is palpable follow me its entire length through a tenderness S-shaped 4476mountvernon.comntour.The clavicle articulates at one finish with the sternum (chest bone) and with the acromion the the scapula at the other. This articulation between the acromial end of the clavicle and also the acromion the the scapula creates the roof the the shoulder.
The scapula is a large, flat triangular bone with three processes called the acromion, spine and 4476mountvernon.comra4476mountvernon.comid process . It creates the back part of the shoulder girdle. The spine (which is located at the back of the scapula) and also the acromion have the right to be easily palpated on a patient.
The flat blade that the scapula glides follow me the ago of the chest allowing for extended movement the the arm. The 4476mountvernon.comra4476mountvernon.comid procedure is a special curved structure that tasks from the scapula and is the attachment point of ligaments and also muscles.
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The scapula is also significant by a shallow, somewhat 4476mountvernon.commma-shaped glenoid cavity , which articulates with the head of the humerus.
The top finish of the humerus 4476mountvernon.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 in between the head and the greater and also lesser tubercles. The greater and lesser tubercles are significant landmarks top top the humerus and also serve as attachment sites because that the rotator cuff muscles.
There are four joints making increase 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 also the glenoid cavity of 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
Note just how the round ( head ) the the humerus fits right into a shallow socket on the scapula dubbed the glenoid .
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One can see that this ball does no fit right into the glenoid cup at all; this permits for the wide range of movement listed by the shoulder, at the 4476mountvernon.comst of skeletal stability. Joint security is noted instead by the rotator cuff muscles , connected bony processes and also glenohumeral ligaments.