Substrate for rapid feedforward inhibition of the auditory forebrain

A sizeable, feedforward, GABAergic projection exists from the inferior colliculus to the medial geniculate body in cats. We compared the dimensions of GABA-immunoreactive and non-immunoreactive axons in the brachium of the cat inferior colliculus, and demonstrate that GABA-immunoreactive axons are a...

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Bibliographic Details
Published in:Brain research 1997-08, Vol.765 (1), p.173-176
Main Authors: Saint Marie, Richard L, Stanforth, D.A, Jubelier, E.M
Format: Article
Language:English
Subjects:
Animals
Axons - physiology
Axons - ultrastructure
Brachial Plexus - cytology
Brachial Plexus - physiology
Brachium
Cat
Cats
Cell Size
gamma-Aminobutyric Acid - metabolism
gamma-Aminobutyric Acid - physiology
Geniculate Bodies - cytology
Geniculate Bodies - physiology
Immunohistochemistry
Inferior Colliculi - cytology
Inferior Colliculi - physiology
Inferior colliculus
Inhibitory neurotransmitter
Medial geniculate
Myelin Sheath - physiology
Myelin Sheath - ultrastructure
Prosencephalon - cytology
Prosencephalon - physiology
Quantitative morphometry
Synaptic Transmission - physiology
γ-Aminobutyric acid (GABA)
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Summary:A sizeable, feedforward, GABAergic projection exists from the inferior colliculus to the medial geniculate body in cats. We compared the dimensions of GABA-immunoreactive and non-immunoreactive axons in the brachium of the cat inferior colliculus, and demonstrate that GABA-immunoreactive axons are among the largest of brachial axons. We propose that, based on their large size, GABAergic tectothalamic axons provide a substrate for rapid feedforward inhibition of geniculate neurons.
ISSN:0006-8993
1872-6240
DOI:10.1016/S0006-8993(97)00654-9