The Left Subclavian Artery is a major blood vessel that branches off from the Aortic Arch. It supplies oxygenated blood to the left arm, parts of the neck, and the upper back. This artery is crucial for delivering nutrients and oxygen to these areas, ensuring proper function and health. Located beneath the collarbone, the Left Subclavian Artery gives rise to several important branches, including the Vertebral Artery, which supplies blood to the brain and spinal cord. It also contributes to the Thyrocervical Trunk, which provides blood to the thyroid gland and surrounding muscles.