following injections of 3h amino acids into electrophysiologically defined regions of the complex in which cardiac or respiratory units were recorded , labeled fibers could be traced to a number of sites in the caudal brain stem including the medial and lateral parabrachial nuclei , kolliker-fuse nucleus and the area ventral to this nucleus , lateral periaqueductal gray matter , ambiguus complex , which consists of the retrofacial , ambiguus and retroambiguus nuclei , ventrolateral reticular nucleus ( in an area equivalent to the a1 cell group of dahlstrom and fuxe , '64 ) , medial accessory olive , paramedian reticular formation , and lateral cuneate nucleus .
C0007610
nucleus
C0007634
cell