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Tytuł pozycji:

Inhibitory innervation of a lobster muscle.

Tytuł :
Inhibitory innervation of a lobster muscle.
Autorzy :
Walrond JP; Department of Anatomy and Neurobiology, Colorado State University, Fort Collins 80523.
Wiens TJ
Govind CK
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Źródło :
Cell and tissue research [Cell Tissue Res] 1990 May; Vol. 260 (3), pp. 421-9.
Typ publikacji :
Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
Język :
English
Imprint Name(s) :
Original Publication: Berlin, New York, Springer-Verlag.
MeSH Terms :
Neural Inhibition*
Muscles/*innervation
Nephropidae/*physiology
Neuromuscular Junction/*physiology
Action Potentials ; Animals ; Freeze Fracturing ; Muscles/ultrastructure ; Neuromuscular Junction/ultrastructure
References :
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Entry Date(s) :
Date Created: 19900501 Date Completed: 19900827 Latest Revision: 20190720
Update Code :
20210210
DOI :
10.1007/BF00297221
PMID :
2372802
Czasopismo naukowe
Inhibitory neuromuscular synapses formed by the common inhibitor (CI) neuron on the distal accessory flexor muscle (DAFM) in the lobster, Homarus americanus, were studied with electrophysiological and electron-microscopic (thin-section and freeze-fracture) techniques. Postsynaptic inhibition as indicated by inhibitory junctional potentials was several-fold stronger on distal compared to proximal muscle fibers. This difference correlated with the results of serial thin-section studies, which showed more inhibitory synapses on distal fibers than on their proximal counterparts. Effects of postsynaptic inhibition on excitatory junctional potentials via current shunting had a morphological correlate in the spatial relationship between inhibitory and excitatory synapses on the distal fibers. Inhibitory synapses were larger than their excitatory counterparts and had fewer glial processes. In freeze-fracture views, inhibitory synapses did not appear as raised plateaus in the P-face as do excitatory synapses, and their active zones were more widely scattered. The intramembrane particles in the inhibitory postsynaptic membrane - representing neurotransmitter receptors - are arranged in parallel rows in the sarcolemmal P-face and have complementary furrows in the sarcolemmal E-face. Altogether, our findings help to describe a population of inhibitory neuromuscular synapses formed by the CI neuron in lobster muscle.

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