Subclavian Artery

The left Subclavian artery arises directly from the arch of the aorta. The right subclavian artery arises with the right common carotid artery from the brachiocephalic trunk. The artery is described in three parts. The first part lies medial to the scalenus anterior, the second part lies posterior to the muscle, and the third part lies lateral to the muscle. At the outer border of the first rib the subclavian continues as the axillary artery.

The subclavian artery can be compressed in the root of the posterior triangle of the neck. Compression against the first rib can stop a catastrophic hemorrhage or reduce the vascular supply to the upper limb.