Cerebral blood flow remains relatively constant and is in-
dependent of modest fluctuations in arterial pressure,
presumably because of its capacity for autoregulation.22-23
After cervical sympathectomy, however, one group reported
that cerebral blood flow rate is no longer constant but varies
with arterial pressure.
The demonstration that non-uniform changes in blood flow
between cortical lobes and between hemispheres could be in-
duced by ischemia26 and neurogenic stimulation26 probably
implicates neurogenic factors. There is some evidence for
heterogeneity of the function of the sympathetic neurons
originating from the superior cervical ganglion.
Adrenergic lnnervation of Large Cerebral Blood
Vessels of the Rabbit Studied by Fluorescence Microscopy
Absence of Features That Might Contribute to Non-Uniform Change
in Cerebral Blood Flow
RALPH E. PURDY, PH.D.,* AND JOHN A. BEVAN, M.D.
STROKE VOL 8, No 1, JANUARY-FEBRUARY 1977