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- W1978990714 abstract "The responses of 65 cells to electrical stimulation of the contralateral optic nerve were intracellularly recorded in the pigeon optic tectum by using micropipettes filled with a solution of horseradish peroxidase. Nineteen of them were successfully labeled. Microscopic examination of the filled cells shows that our sample includes six pyramidal, ten ganglion, two stellate, and one, bipolar horizontal cells. Thus, pyramidal and ganglion neurons constitute the most numerous types of cells in our sample. Pyramidal cells were located in layer II but mostly in its non-retinorecipient part, and they had restricted ascending dendritic trees oriented orthogonal to the tectal lamination. Ganglion cells were located in layer in with one exception, which was in sublayer IIi. These cells had non-oriented dendritic trees which ramify over considerable distances. Terminal dendritic branches from a number of pyramidal and ganglion cells extended superficially well within the region of optic fibers termination. In our study, ganglion cells constituted the efferent tectal elements. Pyramidal cells responded to optic nerve stimulation with a pure EPSP, with an EPSP-IPSP sequence, or with a pure IPSP. Ganglion cells always exhibited an IPSP either alone or preceded by an EPSP. Stellate and bipolar cells responded with a pure EPSP. The study of the laminar distribution of labeled and non-labeled cells shows from surface to depth, a gradual increase in the number of cells responding with an EPSP-IPSP or with a pure IPSP and a gradual decrease in the number of those exhibiting a pure EPSP. The analysis of the sensitivity of EPSPs and IPSPs to high frequency optic nerve stimulation shows that (1) monosynaptic as well as polysynaptic EPSPs can be recorded from cells in the non-retinorecipient tectal region, (2) a number of ganglion and pyramidal cells receive a direct retinal excitatory input as their dendrites pass through the region of optic endings, (3) most IPSPs are polysynaptic, (4) some cells located in the retinorecipient region may receive direct retinal inhibitory connections." @default.
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- W1978990714 date "1985-03-15" @default.
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- W1978990714 title "Morphology and laminar distribution of electrophysiologically identified cells in the pigeon's optic tectum: An intracellular study" @default.
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- W1978990714 doi "https://doi.org/10.1002/cne.902330308" @default.
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