THE CEREBRAL CIRCULATION

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Abstract
The existence of a vasomotor and chemical control of the vessels of the pia has been established by microscopic observation in the living animal,1 and it has been shown by perfusion experiments that volume blood through the brain as a whole may be influenced by similar factors.2 It has not been known, however, to what extent the deeper vessels of the brain participate actively in the control of flow. Penfield3 demonstrated the presence of nerve fibers in the walls of cerebral vessels, and Junet4 and Clark5 showed that the vessels of the choroid plexus also contain nerve fibers, possibly sensory in function. Stöhr6 and also Schapiro,7 investigating several mammals, noted a rich supply of nerves to the different structures of the choroid plexus. Findlay,8 confirming earlier investigations of Chworostuchin, had already observed the presence of nerves in the choroid plexus ("It seems

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