Rostral pontine and caudal mesencephalic control of arterial pressure and iliac, celiac and renal vascular resistance. II. Separate control and topographic organization.
A dense mapping of the rostral pons and caudal mesencephalon was performed in 26 cats using electrical stimulation while measuring arterial pressure and iliac, celiac and renal vascular resistance to determine if these vascular beds are controlled separately. It was found that the central tegmental fields (CTF) of the mesencephalon contained a large area active in control of iliac vascular resistance and a smaller area active in control of renal vascular resistance. It was found that the marginal nucleus of the brachium conjunctivum (BCM) contained areas active in control of all three vascular beds studied. To determine if the BCM controlled regional vascular beds differently, the relationship between changes in vascular resistance in each bed and changes in arterial pressure were examined quantitiatively using regression analysis and the slopes of the regression lines were shown to be different (P less than 0.001). Further analysis of the relationships of changes in vascular resistance of pairs of vascular beds indicated that vascular beds are controlled differently in response to electrical stimulation of the BCM.
D000818:Animals; D001794:Blood Pressure; D002415:Cats; D002445:Celiac Artery / Q000502:physiology*; D005260:Female; D007083:Iliac Artery / Q000502:physiology*; D008297:Male; D008636:Mesencephalon / Q000033:anatomy & histology / Q000502:physiology*; D011149:Pons / Q000033:anatomy & histology / Q000502:physiology*; D012077:Renal Artery / Q000502:physiology*; D012079:Renal Circulation; D014655:Vascular Resistance