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[Ultrastructure of the trigeminal principal sensory nucleus in the norm and during pain threshold stimulation].

Ultrastructural organization of main sensory trigeminal nucleus neurons and synapses was studied in norm and in threshold pain irritation of teeth pulp of the cat. The neurons were divided into small and large ones. The latter were identified according to ultrastructural organization of perikaryon and significant number of axo-somatic synapses, formed by presynaptic terminals of different size. These neurons react to threshold pain irritation. Changes were observed more often in axonic terminals than in the endings of specific pain afferent fibres.