| Abstract: | The fine structure of cells in the trigeminal mesencephalic nucleus was examined in adult mouse and cat. Cell surfaces were studed with small spinous processes which were free of synaptic contacts. Some cells in soma-soma and axosomatic contact were joined by maculae and membrane fusions resembling in cross section the zonula adherens and macula occludens of epithelial cells. Synapses containing three distinct morphological types of vesicles contacted the cell soma. The possible functions of synapses and membrane fusions were discussed. |
