Relations
The clavicle articulates with the manubrium to form the anterior border of the thoracic inlet. Superior to the thoracic inlet is the root of the neck, and the superior mediastinum is related inferiorly.
The brachial plexus is a superolateral relation of the thoracic inlet. The brachial plexus emerges between the anterior and middle scalene muscles, superior to the first rib, and passes obliquely and inferiorly, underneath the clavicle, into the shoulder and then the arm. Impingement of the plexus in the region of the scalenes, ribs, and clavicles is responsible for thoracic outlet syndrome.
Read more about this topic: Superior Thoracic Aperture
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