Volume expansion does not activate neuronal projections from the NTS or depressor VLM to the RVLM.
AD Shafton, A Ryan, B McGrath, E Badoer
Am J Physiol | Published : 1999
We investigated whether a monosynaptic connection from the nucleus tractus solitarius (NTS) or the depressor ventrolateral medulla (VLM) to the pressor region of the rostral VLM (RVLM) constituted part of the reflex pathway activated by cardiopulmonary baroreceptors. Volume expansion in the conscious rabbit, which elicits renal nerve inhibition predominantly via cardiac mechanoreceptors, was used as the stimulus. The protein Fos was used as a marker of neuronal activation. The retrogradely transported tracer rhodamine-tagged microspheres, previously injected into the pressor region of the RVLM, identified medullary neurons that projected to that region. Volume expansion significantly increas..View full abstract