Purkinje cells are large neurons with many branching extensions that is found in the cortex of the cerebellum. It plays an important role in controlling motor movement. These cells were first discovered in 1837 by Czech physiologist Jan Evangelista Purkinje. They are characterized by cell bodies that are flask - like in shape, by numerous branching dendrites, and by a single long axon. Most Purkinje cells release a neurotransmitter called GABA which exerts inhibitory actions on certain neurons and thereby reduces the transmission of nerve impulses.