Re: cerebral blood flow during sleep [HAPP-L]

[Alice Mills <amills@xxxxxxx>]

> > I thought that cerebral blood flow increased to areas of brain that are 
> > active; this is the basis for scans such as the functional MRI scan.
>
> A student in my lecture said that his psychology text stated that cerebral 
> blood flow is the same during sleep and the awake state.  I think that 
> cerebral blood flow would be decreased during sleep.

More info, from 1981 Berne & Levy Cardiovascular Physiology text:

Any increase in arterial inflow to brain must be accompanied by increase in 
venous outflow, because otherwise there would be an increase in pressure in 
the brain that can't be relieved due to being surrounded by a rigid 
skull.  Average blood flow (they did not give a range, just said the range 
is "narrow") is 55mL/min/100gm of brain tissue.


Dr. Alice Mills
Dept. of Biological Sciences
University of Tennessee at Martin
Martin, TN  38238
(731) 587-7175
(731) 587-7187 (fax)


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