Localization of extratectally evoked visual response in the corpus and valvula cerebelli in carp, and cerebellar contribution to 'dorsal light reaction' behavior.
In carp with the optic tectum removed bilaterally, the optic nerve stimulation evoked a surface positive response on the cerebellum, which originated in the granular layer. In the corpus cerebelli, the response was composed of a single component, well localized at the rostromedial part, supporting previous electrophysiological and morphological findings. In the valvula cerebelli, on the other hand, the response consisted of two wave components of oligo-synaptic and poly-synaptic transmission. The former distributed diffusely and was comparable to the corporeal response, while the latter localized at the rostrolateral part of the ventral valvula. Dorsal light reaction (DLR), which remained after optic tectum ablation, was slightly impaired by a lesion of the visual projection area in the corpus cerebelli, but recovered within a few days. The impairment was marked due to a lesion of the valvula cerebelli and recovery was prolonged. When above lesions were combined, the impairment was not summative but recovered much earlier, suggesting a complex neural network for DLR regulation mechanism.
Mori
S
S
Department of Equilibrium Adaptation Research, Nagoya University, Japan.
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D002347:Carps / Q000502:physiology*; D002531:Cerebellum / Q000502:physiology*; D004558:Electric Stimulation; D005074:Evoked Potentials, Visual / Q000502:physiology*; D008839:Microelectrodes; D009900:Optic Nerve / Q000502:physiology; D013477:Superior Colliculi / Q000502:physiology; D013687:Telencephalon / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology