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. Author manuscript; available in PMC: 2012 Sep 8.
Published in final edited form as: Neuroscience. 2011 Jun 12;190:207–227. doi: 10.1016/j.neuroscience.2011.06.005

Fig. 6. Lateral and rostral NTS nuclei are retrogradely labeled from the Bötzinger complex (BötC), while few neurons in caudomedial NTS nuclei project to BötC.

Fig. 6

FG was injected caudal to the facial nucleus and below the compact part of nucleus ambiguus (C; case 7078). Section A is ~ 200 μm caudal and B is ~ 300 μm rostral to obex. Expiratory unit activity characteristic of BötC was recorded at the injection site (inset). Moderately dense retrograde labeling was apparent in only a few NTS nuclei, most prominently in the intermediate nucleus (SolIM). Relatively few neurons were labeled in the medial (SolM) or commissural (SolC) nuclei and no retrograde labeling was observed in area postrema (AP). EMG in inset is inspiratory motor activity. ECG activity was manually reduced on the EMG trace to facilitate visualization of the respiratory cycle.