Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase.

Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Research Abstract Details 

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Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Abstract Text:

D M Berson,A M Graybiel,

The superficial layers of the cat's superior colliculus innervate the medial subdivision of the thalamic lateral posterior nucleus (LPm). LPm is set off from adjoining thalamic zones by its denser staining for acetyl-cholinesterase (AChE). We sought to learn whether the tectal afferents to LPm might themselves be the source of the enzyme staining by examining the effects of collicular lesions on the thalamic staining pattern. Large excitotoxin lesions of the colliculus largely eliminated AChE staining in the ipsilateral LPm. By contrast, fibersparing lesions of LPm itself left AChE staining nearly unchanged. Destruction of collicular neurons by excitotoxins dramatically reduced AChE staining in fibers of the brachium and superficial gray layer of the superior colliculus. The reduction was especially pronounced in the lower part of the superficial gray layer, in which LP-projecting collicular neurons are located. These results are consistent with the view that LP-projecting collicular neurons synthesize AChE and account for much of the histochemically detectable enzyme present both in the lower superficial gray layer and in LPm. In the colliculus, the excitotoxin lesions spared AChE staining in a thin sheet at the upper border of the superficial gray layer and in the enzyme-positive patches in the intermediate layers. This surviving tectal AChE thus is probably presynaptic and could be contained at least partly in cholinergic afferents from the parabigeminal nucleus and pontomesencephalic tegmentum. The collicular lesions had no obvious effect on AChE staining in the parabigeminal nucleus or in the C-laminae or ventral division of the lateral geniculate nucleus.

Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Publishing Authors By Initials

DM Berson,AM Graybiel,

For similar nervous system: central nervous system: brain: prosencephalon: diencephalon: thalamus: thalamic nuclei research abstracts see: nervous system: central nervous system: brain: prosencephalon: diencephalon: thalamus: thalamic nuclei research

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Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 84

Page Numbers: 478-86

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ISSN: 0014-4819

DAY: 15

MONTH: 02

YEAR: 1991

Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Keywords Mesh Terms:

KEYWORDS: Thalamic Nuclei

MESH TERMS: enzymology

Chemical & Substance for Abstract: Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase. Information

Substance Name: Acetylcholinesterase

Registry Number: EC 3.1.1.7

Grant and Affiliation Information for Tectorecipient zone of cat lateral posterior nucleus: evidence that collicular afferents contain acetylcholinesterase.

AFFILIATION: Section of Neurobiology, Brown University, Providence, RI 02912.

Country: GERMANY

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MEDLINETA: Exp Brain Res

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