ULTRACYTOCHEMISTRY OF CHOLINE ACETYLTRANSFERASE IN THE NEOSTRIATUM OF THE RAT BRAIN

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The localization site of choline acetyltransferase (ChAc) activity in the neostriatum of the rat brain was ultracytochemically examined. Two of six neuronal types showed ChAc activity, which had previously been reported to be medium-sized interneurons with the Golgi method and an electron microscope 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 findings reported elsewhere that all types of neurons in the neostriatum synthesize acetylcholinesterase. A hypothetical schema of neuronal network concerned with neurotransmitters in the neostriatum was proposed.