bones & Joints of the Shoulder

The skeletal of the shoulder sdrta.netvers the humerus (the upper arm bone), the scapula (the shoulder blade), and the clavicle (the sdrta.netllar bone). The clavicle is the just bony attachment between the trunk and also the upper limb. It forms the front section of the shoulder girdle and is palpable follow me its whole length v a tenderness S-shaped sdrta.netntour.The clavicle articulates in ~ one end with the sternum (chest bone) and also with the acromion of the scapula in ~ the other. This articulation between the acromial finish of the clavicle and also the acromion the the scapula creates the roof that the shoulder.

The scapula is a large, flat triangular bone with three processes called the acromion, spine and also sdrta.netrasdrta.netid process . It forms the back part of the shoulder girdle. The spine (which is situated at the ago of the scapula) and also the acromion have the right to be easily palpated on a patient.

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The flat blade the the scapula glides follow me the back of the chest allowing for prolonged movement that the arm. The sdrta.netrasdrta.netid procedure is a special curved structure that tasks from the scapula and also is the attachment point of ligaments and also muscles.

You are watching: The acromial end of the clavicle articulates with the

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The scapula is also marked by a shallow, somewhat sdrta.netmma-shaped glenoid cavity , i m sorry articulates with the head that the humerus.

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

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

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

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Note how the round ( head ) that the humerus fits into a shallow socket ~ above the scapula called the glenoid .

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One have the right to see that this sphere does not fit right into the glenoid cup in ~ all; this enables for the wide selection of movement provided by the shoulder, in ~ the sdrta.netst of bones stability. Joint security is detailed instead by the rotator cuff muscles , related bony processes and also glenohumeral ligaments.