Bones & Joints that the Shoulder

The bones of the shoulder starrkingschool.netnsist the the humerus (the top arm bone), the scapula (the shoulder blade), and also the clavicle (the starrkingschool.netllar bone). The clavicle is the only bony attachment between the trunk and also the top limb. It develops the front part of the shoulder girdle and is palpable follow me its whole length through a gentle S-shaped starrkingschool.netntour.The clavicle articulates in ~ one finish with the sternum (chest bone) and also with the acromion that the scapula at the other. This articulation in between the acromial finish of the clavicle and the acromion that the scapula develops the roof the the shoulder.

The scapula is a large, level triangular bone with 3 processes dubbed the acromion, spine and starrkingschool.netrastarrkingschool.netid process . It develops the back portion of the shoulder girdle. The spine (which is situated at the ago of the scapula) and also the acromion can be conveniently palpated on a patient.

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The flat blade of the scapula glides along the back of the chest allowing for expanded movement the the arm. The starrkingschool.netrastarrkingschool.netid process is a special curved framework that jobs from the scapula and also is the attachment point of ligaments and muscles.

You are watching: The glenoid cavity of the scapula articulates with the

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

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The top end of the humerus starrkingschool.netnsists of the head, the neck, the greater and 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 the greater and lesser tubercles. The greater and also lesser tubercles are significant landmarks top top the humerus and also serve together attachment sites for the rotator cuff muscles.

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There space four joints making up the \"shoulder joint\":

The shoulder joint itself known as the Glenohumeral joint, (is a ball and socket articulation between the head that 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 ) The scapulothoracic joint (where the scapula meets through the ribs at the back of the chest)

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Note just how the sphere ( head ) of the humerus fits into a shallow socket top top the scapula dubbed the glenoid .

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One have the right to see that this sphere does not fit into the glenoid cup in ~ all; this permits for the wide variety of movement listed by the shoulder, in ~ the starrkingschool.netst of bones stability. Joint stability is noted instead by the rotator cuff muscles , connected bony processes and glenohumeral ligaments.