Nucleus of the tractus solitarius projections to the olfactory tubercle: an HRP study. 
Labelled cells were found in the nucleus of the tractus solitarius (NTS) after horseradish peroxidase injections in the olfactory tubercle (OT) of the rat.  These results suggest a direct pathway from the NTS to the OT.  The importance of this pathway in a neural circuit related to autonomic functions is discussed.