The Origin of Hypoglossal Vasoconstrictor Nerves and of Accessory Vasodilator Nerves in the Bullfrog's Oblongate Medulla

Abstract

1) It is demonstrated on a temporarily designated “carmin nicotine microinjection method” that the hypoglossal vasoconstrictor fibers of bullfrog's tongue have their own origin in the oblongate medulla.
2) It is revealed on a “carmin nicotine microinjection method” that the accessory vasodilator fibers of bullfrog's tongue have their own origin in the oblongate medulla.
3) The results of 1) and 2) support to conclude that there exist two functionally separate vasomotor origins i. e., hypoglossal vasoconstrictor origin and accessory vasodilator origin in bullfrog's oblongate medulla.