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The scapula is the most important bone at the posterior side of the thorax. It has a very prominent spine that is easy to palpate. Feel the scapula’s acromion which can be recognized as a flat bone overlying the shoulder joint.Palpate the anterior aspect of the clavicle and
continue further laterally until the acromial end is felt. Just lateral to it a small indentation is palpable before the clear anterior border of
the acromion is reached. This indentation is the anterior end of the acromioclavicular joint. By moving the palpating finger on top of the shoulder the acromial end of the clavicle can be felt to lie slightly higher than the acromion. When the finger lies in contact with the two bones
– the clavicle and the acromjon
– it lies on the acromioclavicular joint of which the upper part of the
capsule is reinforced with the superior acromioclavicular

In the infraclavicular fossa just below the concave lateral part of the clavicle a bony prominence between the clavicle and acromion. The acromioclavicular joint line joins these two points.

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