insulin and the brain

[Matt Jones]

In article <41hpov$mqk at whitbeck.ncl.ac.uk> erasmus harland,
p.s.e.harland at ncl.ac.uk writes:
>I am interested in brain metabolism, how does insulin function in 

My understanding was that insulin doesn't cross the blood/brain barrier,
and so doesn't have direct effects on neurons, but rather indirect
effects through altering the glucose levels in the blood the goes to the
brain. Is this completely wrong?

Matt