Morphology and location of tectal projection neurons in frogs: A study with hrp and cobalt‐filling

Tectal projection neurons were labeled by retrograde transport of horseradish peroxidase (HRP) or cobaltic‐lysine. The tracer substances were delivered iontophoretically or by pressure injection or diffusion into various regions of the brain or spinal cord. Histochemical procedures allowed identification of labeled cells projecting to the injected regions. Many neurons were filled with cobaltic‐lysine, resulting in a Golgi‐like staining.

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