cardiac plexus

n.
  1. A wide-meshed network of anastomosing cords from the sympathetic and vagus nerves that surrounds the arch of the aorta and the pulmonary artery and continues to the atria, ventricles, and coronary vessels.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.