bilateral removal of the inferior and medial cervical ganglia results in almost complete loss of catecholamines from atria and ventricles , disappearance of catecholamine-associated histofluorescence from the region of the sinoatrial node and marked depression of the chronotropic concentration-response curve for tyramine in right atria of both species .
C0037189
sinoatrial node
C0225844
right atria