Structural and functional heterogeneity in an insect muscle

The Journal of Experimental Zoology
D R StokesR B Price

Abstract

Singing muscles of the katydid, Neoconocephalus robustus (Insecta, Tettigoniidae) are neurogenic, yet perform at contraction-relaxation frequencies as high as 212 Hz (Josephson and Halverson, '71). The mechanical and electrical responses of different bands of one of these muscles (the dorsal longitudinal muscle, DLM) has been examined with respect to ultrastructural features of each part which may be related to muscle performance. The DLM is composed of three bands and is innervated by four motoneurones. The cell bodies of three of these motoneurones occur ipsilaterally in the prothroracic ganglion; the cell body of the other motoneurone is contralateral in the mesothoracic ganglion. Three of the motoneurones (as yet unidentified fast axons) initiate extraordinarily fast twitches (rise time equal 7.3 msec, half duration equals 14.3 msec, 25 C), the fourth (an unidentified slower axon) evokes twitches which are considerably slower (rise time equals 18.9 msec, half duration equals 5.10 msec). Whereas the ventral and medial bands of the muscle are innervated only by fast axons (some fibers of the medial band are doubly innervated), the dorsal band is innervated by both a fast axon and the slower axon. A few fibers of the dorsal ba...Continue Reading

References

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Citations

Sep 1, 1975·The Journal of Experimental Zoology·R K JosephsonV Chen
Oct 1, 1975·The Journal of Experimental Zoology·R K Josephson
Jan 1, 1978·Tissue & Cell·R ValvassoriG Lanzavecchia
May 29, 2003·Journal of Insect Physiology·Sakiko ShigaTsuneo Yamaguchi
May 24, 2013·Journal of Neurophysiology·José G CrespoFranz Goller
Apr 14, 2012·Journal of the Mechanical Behavior of Biomedical Materials·John A HodgsonShantanu Sinha
Dec 15, 2005·Zoology : Analysis of Complex Systems, ZACS·Natalia M Biserova, Hans-Joachim Pflüger
Sep 5, 1996·Nature·K E Conley, S L Lindstedt
Jun 1, 1989·The Journal of Experimental Zoology·A Novicki
Sep 25, 1981·Molecular and Cellular Biochemistry·P A BrileyP D Turner
Jan 1, 2008·The Journal of Experimental Biology·William M Kier, Frederick H Schachat
Mar 1, 1979·Journal of Ultrastructure Research·G LanzavecchiaP Lanzavecchia
Jan 15, 1978·The Journal of Comparative Neurology·J E Mittenthal, J J Wine

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