Abstract
Conduction velocities of the optic nerve (ON) in the rat were measured by recording evoked unitary discharges of postsynaptic cells to stimulation of the ON at two separate sites. The velocity of ON impulses to activate a given postsynaptic cell was calculated from the distance between the two stimulating sites and the difference in response latency of the same postsynaptic cell. Recordings were made from the lateral geniculate body (LGB) and the superior colliculus (SC), both contralateral to stimulation. ON fibers innervating principal cells of the LGB (P cells of Burke and Sefton) fell into three groups (t g0, t g1 and t g2) having average velocities of 19.2, 11.9, and 5.2 m/sec, respectively. Internuncial cells (I cells) received t g2 fibers only. There were also three groups of ON fibers destined for the SC (t c0, t c1 and t c2). Their average velocities were 15.4, 9.1, and 3.7 m/sec, respectively.
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