Monday, May 9, 2011

Left Subclavian Artery

The left subclavian artery is an oxygen-rich blood vessel which branches off the aortic arch of the aorta, beside the left common carotid artery, supplying the left arm, spinal cord, ear, and brain. To facilitate the description, the left subclavian artery can be divided into three sections. The first section extends from the aortic arch to the medial border of the Scalenus anterior; the second lies behind this muscle; and the third extends from the lateral margin of the muscle to the outer border of the first rib, where it becomes the axillary artery.