Document Detail

Neural- and endocrine control of flight muscle degeneration in the adult cricket, Gryllus bimaculatus.
MedLine Citation:
PMID:  12770128     Owner:  NLM     Status:  Publisher    
Neural- and endocrine mechanisms controlling degeneration of a dorsal longitudinal flight muscle, M112a, have been studied in adult Gryllus bimaculatus (Orthoptera: Gryllidae). Decapitation completely prevented muscle degeneration. Implantation of a pair of corpora allata or injection of juvenile hormone III into decapitated crickets caused muscle degeneration. Denervation of M112a resulted in reduction of muscle mass compared with that in sham-operated crickets. Denervation of M112a in decapitated crickets, however, did not affect muscle mass. Birefringence and ultrastructure of M112a showed an obvious regional difference in the onset of degeneration. Fibrillar structures of M112a always disappeared from the ventral to dorsal part. Distribution of axon terminals of motor neurons and mechanical responses to the motor nerve stimuli showed that M112a is composed of five motor units with similar twitch properties. When M112a was fully denervated, regional differences in degeneration disappeared. Partial denervation resulted in denervated muscle fibers losing birefringence earlier than innervated fibers. These results suggest that juvenile hormone causes breakdown of flight muscles, and neural factors control degeneration of flight muscles to some extent under the presence of the juvenile hormone.
Sakiko Shiga; Kouji Yasuyama; Naoko Okamura; Tsuneo Yamaguchi
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Publication Detail:
Journal Detail:
Title:  Journal of insect physiology     Volume:  48     ISSN:  1879-1611     ISO Abbreviation:  J. Insect Physiol.     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2003-May-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  15-24     Citation Subset:  -    
Department of Biology, Faculty of Science, Okayama University, 700-0082, Okayama, Japan
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