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• W1990506507 endingPage "712" @default.
• W1990506507 startingPage "701" @default.
• W1990506507 abstract "The optic tectum of teleosts contains high concentrations of nicotinic and muscarinic acetylcholine receptors and receives putative cholinergic innervation from both nucleus isthmi in the tegmentum and a population of intrinsic tectal cells. Using in vitro preparations of goldfish brain, we have examined the effects of cholinergic antagonists and stimulation of nucleus isthmi on the tectal response to optic nerve stimulation. Our results show that: (1) a long latency component of the retinotectal field potential is polysynaptic in origin and occurs in isolated tectum; (2) this component can spread across the tectum from a beam of stimulated fibers and can appear in areas where the monosynaptic response is small or absent; (3) both monosynaptic and long latency components of the field potential are enhanced by prior stimulation of nucleus isthmi or the tectobulbar tract (15–300 ms); (4) both the long latency component of the field potential and the effects of stimulation of nucleus isthmis or tectobulbar tract are blocked by low concentrations of nicotinic antagonists; and (5) in deeper tectum a second polysynaptic response uncovered by pharmacological block of inhibition is not blocked by nicotinic antagonists. These results indicate that the cholinergic neurons intrinsic to tectum have a role in the spread of retinotectal excitation by nicotinic actions, and that stimulation of nucleus isthmi or tectobulbar tract facilitates activity in this system. There is in addition a separate recurrent excitatory circuit in tectum." @default.
• W1990506507 created "2016-06-24" @default.
• W1990506507 creator A5035942835 @default.
• W1990506507 creator A5087554751 @default.
• W1990506507 date "1991-01-01" @default.
• W1990506507 modified "2023-09-25" @default.
• W1990506507 title "The long latency component of retinotectal transmission: Enhancement by stimulation of nucleus isthmi or tectobulbar tract and block by nicotinic cholinergic antagonists" @default.
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• W1990506507 doi "https://doi.org/10.1016/0306-4522(91)90006-a" @default.
• W1990506507 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1648183" @default.
• W1990506507 hasPublicationYear "1991" @default.
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