[Ultrastructure of mitotically dividing cells with signs of neurons in the rat brain].

Ultrastructure of mitotically dividing cells in the sensomotor cerebral cortex of mature rats has been investigated, after transplantation into them embryonal nervous tissue of 17-day-old embryos. In 4 days after the operation in the recipient's nervous tissue, arranging around the developing transplant, among various proliferating cells with mitotic figures, some cells with signs of neurons (oval bodies, electron opaque cytoplasm with developed organelles and RNP-particles, specific for the nervous cell, with axonal terminals on the body) have been found. These cells are surrounded with the satellite glia. There are no mitotic figures in the pyramidal neurons.