Superficial Cardiac Plexus
The Cardiac Plexus receives contributions from the cervical and thoracic portions of the sympathetic trunk, the cervical and thoracic portions of the vagus nerves, and afferent fibers. It is divided into superficial and deep parts, but this is merely a descriptive division and functionally they are one. The Superficial (cardiac) Plexus lies in the concavity of the aortic arch to the right of the ligamentum arteriosum. The deep (cardiac) plexus is larger and lies posterior to the aortic arch in the areolar tissue over the tracheal bifurcation. The deep plexus divides to supply the right and left atria, and form the coronary and pulmonary plexuses.