Fig. 21

Mean arterial pressure (Pm _ar ), blood flow (electromagnetic flow probe) in a hindfoot arteria (flow A. dors. ped.) and in an arterial branch to the spleen (flow R. a. lien) measured in an anesthetized artificially ventilated dog under neuromuscular blockade with sino-aortic denervation and vagotomy. Shown are effects induced by heating (white bar) and cooling (black bar) the hypothalamus as a deep-body thermosensor by means of a water-perfused, stereotaxically inserted thermode (T _p water temperature at the entrance of the thermode). Enhanced skin blood flow during heating and reduced skin blood flow during cooling are approximately matched by opposing visceral blood flow changes. Note that arterial pressure changes little despite the absence of baroreflex control. From Göbel et al. [11]