5-HT2A is expressed widely throughout the central nervous system
(CNS). It is expressed near most of the serotoninergic terminal rich areas, includingneocortex
(mainly prefrontal
, parietal
, andsomatosensory cortex
) and the olfactory tubercle
. Especially high concentrations of this receptor on the apical dendrites
of pyramidal cells
in layer V
of the cortex may modulate cognitive processes,[8]
[9]
[10]
by enhancing glutamate
release followed by a complex range of interactions with the 5-HT1A
,[11]
GABAA
,[12]
adenosine A1
,[13]
AMPA
,[14]
mGluR2/3
,[15]
mGlu5
,[16]
andOX2
receptors.[17]
[18]
In the rat cerebellum, the protein has also been found in the Golgi cells
of the granular layer
,[19]
and in the Purkinje cells
.[20]
[21]