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PMID: 4271083 Published · ppublish English Journal Article

Studies on the site of termination of static and dynamic fusimotor fibres within muscle spindles of the tenuissimus muscle of the cat.

The Journal of physiology ·Vol. 233 ·No. 3 ·1973-09-00 ·Pages 553-73

Brown MC, Butler RG

Abstract

1. The site of termination of static and dynamic fusimotor fibres has been mapped by finding which intrafusal muscle fibres have been depleted of glycogen as a result of tetanic stimulation of single gamma fibres. Long periods of stimulation coupled with occlusion of the blood supply were necessary to cause glycogen depletion.2. In cat tenuissimus muscle, dynamic gamma motor fibres always activated bag intrafusal muscle fibres, and occasionally chain fibres. Static gamma fibres always activated chain fibres and frequently activated bag fibres as well.3. It is argued that these results can be fitted into the hypothesis of the mechanism of internal functioning of the spindle originally proposed by Jansen & Matthews (1962). It is also pointed out that the results raise problems concerning the mechanism of development of the spindle motor innervation.

MeSH Terms
Action Potentials Animals Cats Electric Stimulation Glycogen/metabolism Motor Neurons Muscle Contraction Muscle Spindles/drug effects,metabolism Muscles/innervation Nerve Endings Neural Conduction Rabbits Succinylcholine/pharmacology
Chemicals
Glycogen Succinylcholine
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Brown M C
Butler R G
References (28)
28 references, click to expand
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Article Info
Journal
The Journal of physiology
Abbr.
J Physiol
ISSN
0022-3751
DOI
10.1113/jphysiol.1973.sp010323
Published
1973-09-00
Pages
553-73
Language
English
Region
England
NLM ID
0266262
PMCID
PMC1350592
Subset
IM
External Links
PubMed source DOI: 10.1113/jphysiol.1973.sp010323 PMC Full Text View journal details
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