Abstract
1. This paper describes experiments carried out to record from output cells in the isthmo-optic nucleus.
2. One-hundred and twenty-seven axonal responses were fired at fixed latency from the optic nerve-head.
3. Ninety-nine cell responses were fired trans-synaptically from the optic nerve-head.
4. Ninety-four cells were activated antidromically from the optic nerve-head.
5. Tectal tracks could be recognized by the field potential profile of the N-wave, R-wave and P-wave, and by the occurrence of fixed latency axonal responses and trans-synaptically fired cells.
6. Tectal tracks were verified histologically.
7. Tracks yielding antidromically activated cells were traced histologically to the isthmo-optic nucleus.
8. The antidromic A-wave could be recorded from the nucleus, corresponding in timing to the invasion of cell bodies.
9. Somatic records in the nucleus could be recognized by their duration, conformation, and A—B blocking.
10. When antidromic discharge was interacted with orthodromic firing, collision evidence could be provided, showing that the orthodromic impulse travels centrifugally to the retina.
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