[Distribution of the fiber endings running from the superior colliculi of the tectum mesencephali into the visual projection zone (field 17) of the cat cerebrum].

Distribution of fibrillar terminals, taking origin from the anterior colliculi of the midbrain tectum, in the central visual field 17 has been studied electron microscopically. Degenerating axonal terminals are detected in layers IV, V, VI and I. They are most numerous in layer IV. Most of them form contacts on small dendritic branches, at the same time, in layer IV other forms of degenerated interneuronal contacts occur rather often: on spiculae, on dendrites of larger diameter, in some cases,--on their main trunks. A suggestion is made that in the visual projection zone distribution and termination of the fibers taking origin from the anterior colliculi of the midbrain tectum are similar to the projection organization in other specific visual structure--the lateral geniculate body.