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[Tecto-thalamo-telencephalic interrelationships following visual deafferentation].

Authors
Type
Published Article
Journal
Zhurnal vyssheĭ nervnoĭ deiatelnosti imeni I P Pavlova
Publication Date
Volume
28
Issue
1
Pages
153–161
Identifiers
PMID: 636640
Source
Medline

Abstract

21-23 months after uni- and bilateral enucleation of the eyes, the turtles Emys orbicularis and Testudo horsfieldi exhibited atrophy, gliosis and residual degenerative changes in the visual nerves and tracts and in the two upper layers of the optic tectum, as well as a reduced density of fibres in the tecto-thalamic tract on the deafferentated side. Electrophysiological experiments on the turtles have shown that tectal impulses en route to the general cortex of the forebrain are relayed in the n. rotundus. Conduction of impulses along the tecto-geniculo-cortical path, found in intact animals, ceases, which is apparently due to transsynaptic changes in the surface layers of the optic tectum.

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