Document Detail

Central connections of receptors on rotated and exchanged cerci of crickets.
MedLine Citation:
PMID:  1055395     Owner:  NLM     Status:  MEDLINE    
The cerci of crickets, paired abdominal appendages bearing sound-sensitive filiform hairs, can be removed and grafted back so that their morphological axes acquire various relationships to those of the body. We have studied both the morphogenetic consequences of such surgery and the central connections made by the regenerating axons of the cercal sensory neurons. If a cercus is rotated and grafted back into its own socket, it back-rotates towards its original orientation in succeeding molts. If left and right cerci are exchanged, with or without rotation, back-rotation does not occur and super-numerary cerci are formed in predictable locations. There are two sub-populations of filiform hairs: those that vibrate transversely to the cercal shaft (T-hairs) in dorsal and ventral sectors, and longitudinally vibrating hairs (L-hairs) in lateral and medial sectors. Two giant interneurons are excited by T-hairs of their own side but not by L-hairs. If cerci are grafted so that they assume various orientations relative to the body, a consistent physiological result is obtained: T-hairs always appear to be the source of excitatory input to the giant interneurons, no matter where they are caused to be located by prior surgery. The phenomena of back-rotation, formation of supernumerary cerci, and formation of connections selectively by T-hairs, can be interpreted on the hypothesis of morphogenetic gradients.
J Palka; M Schubiger
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  72     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  1975 Mar 
Date Detail:
Created Date:  1975-07-14     Completed Date:  1975-07-14     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  966-9     Citation Subset:  IM    
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MeSH Terms
Interneurons / cytology
Neural Pathways
Orthoptera / anatomy & histology*,  cytology
Sensory Receptor Cells / anatomy & histology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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