PMID: 6966525Jun 23, 1980Paper

Anatomy and physiology of a binocular system in the frog Rana pipiens

Brain Research
Edward R Gruberg, J Y Lettvin

Abstract

The locations of tectal neurons projecting to nucleus isthmi (n. isthmi) were found by iontophoretic injection of horseradish peroxidase (HRP) into n. isthmi. After retrograde transport, stained tectal somata are found to lie almost exclusively in layer 6 and below of the ipsilateral tectum. Many cells are colored throughout the extent of their dendrites into the fine rami, giving the appearance of a Golgi stain. Nucleus isthmi receives projections from the ipsilateral tectum and from no other region. Nucleus isthmi units recorded electrically respond to visual stimuli and are arranged in a topographic map of the visual field. There are two types of receptive fields, those with small centers and those with large centers. The small centers are about 3-5 degrees in diameter, similar to type 2 optic nerve fibers. Their response is to many of the same geometric features of stimulus as excite type 2 fibers. The large centers are at least 7-10 degrees in diameter and respond to many of the same features as excite types 3 and 4 optic nerve fibers. The responsiveness of small and large center n. isthmi units is very similar to the elements of the ipsilateral visual field projection onto tectum, i.e. the neuropilar units recorded in lay...Continue Reading

References

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Citations

Jan 1, 1988·Anatomy and Embryology·R McCart, C Straznicky
Jan 1, 1988·Biological cybernetics·D H House
Jul 1, 1985·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·F Gaillard
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Oct 6, 2006·Visual Neuroscience·Noriaki HoshinoNobuyoshi Matsumoto
Aug 24, 2006·Brain, Behavior and Evolution·María del Carmen de Arriba, Manuel A Pombal

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