[TA] parasympathetic ganglia of the cardiac plexus lying between the ascending aorta and the bifurcation of the pulmonary artery and of the plexus extension onto the atria and atrioventricular groove. One such ganglion is commonly found adjacent to the ligamentum arteriosum; the ganglia consist of postsynaptic parasympathetic neurons that send fibers to the nodal tissue and periarterial plexuses of the coronary arteries. SYN: ganglia cardiaca [TA], Wrisberg ganglia.