ULTRACYTOCHEMISTRY OF CHOLINE ACETYLTRANSFERASE IN THE NEOSTRIATUM OF THE RAT BRAIN

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Abstract
The localization site of choline acetyltransferase (ChAc) activity in the neostriatum of the rat brain was ultracytochemically examined. Of 6 neuronal types, 2 showed ChAc activity, which were previously reported to be medium-sized interneurons with the Golgi method and an EM study. All types of neurons except Cajal''s dwarf cell in the neostriatum were revealed to receive a bouton containing ChAc positive synaptic vesicles and to form an axo-somatic synapse. This evidence was compatible with other findings that all types of neurons in the neostriatum synthesize acetylcholinesterase. A hypothetical schema of neuronal network concerned with neurotransmitters in the neostriatum was proposed.