spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kalogianni, E.
Right arrow Articles by Theophilidis, G.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Kalogianni, E.
Right arrow Articles by Theophilidis, G.

Journal of Experimental Biology, Vol 174, Issue 1 123-138, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

CENTRALLY GENERATED RHYTHMIC ACTIVITY AND MODULATORY FUNCTION OF THE OVIDUCTAL DORSAL UNPAIRED MEDIAN (DUM) NEURONES IN TWO ORTHOPTERAN SPECIES (CALLIPTAMUS SP. AND DECTICUS ALBIFRONS)

E. Kalogianni and G. Theophilidis

The rhythmic firing pattern of the putatively octopaminergic dorsal unpaired median (DUM) neurones supplying the oviductal system of female orthopterans, Calliptamus sp. and Decticus albifrons, was examined. Our data provide evidence that the oviductal DUM neurones in the seventh abdominal ganglion modulate the oviductal motor pattern, both peripherally and centrally, during the inhibition of egg-laying behaviour. In a minimally dissected animal, rhythmic activation of the oviductal DUM and motor neurones can be readily elicited by isolation of the seventh abdominal ganglion from the anterior part of the nerve cord. The bursting activity of the DUM neurones is temporally correlated with the oviductal motor rhythm. Both populations of oviductal neurones retain their rhythmic firing pattern after total isolation of the genital ganglia, indicating the presence of an oviductal central pattern generator. The effects of stimulation of oviductal DUM neurones on the oviductal motor activity were monitored by recording intracellularly from oviductal muscle fibres and extracellularly from motor axons. These effects consist of a reduction in the amplitude and frequency of excitatory postsynaptic potentials (EPSPs) in the muscle fibre and in the firing rate in oviductal motor neurones. We suggest that the change in EPSP amplitude results from peripheral release of octopamine by DUM neurones. The decreased firing rate of motor neurones, however, appears to be a central effect, possibly caused by central release of octopamine by DUM neurones.


This article has been cited by other articles:


Home page
 J. Exp. Biol.Home page
P. L. Newland and P. Yates
Nitrergic modulation of an oviposition digging rhythm in locusts
J. Exp. Biol., December 15, 2007; 210(24): 4448 - 4456.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
O. Morris, C Duch, and P. Stevenson
Differential activation of octopaminergic (DUM) neurones via proprioceptors responding to flight muscle contractions in the locust
J. Exp. Biol., January 12, 1999; 202(24): 3555 - 3564.
[Abstract] [PDF]

Home page
 J. Exp. Biol.Home page
R. Johnston, C Consoulas, H Pfl ger, and R. Levine
Patterned activation of unpaired median neurons during fictive crawling in manduca sexta larvae
J. Exp. Biol., January 1, 1999; 202(2): 103 - 113.
[Abstract] [PDF]

Home page
 J. Neurosci.Home page
M. Monastirioti, C. E. Linn, Jr., and K. White
Characterization of Drosophila Tyramine beta -Hydroxylase Gene and Isolation of Mutant Flies Lacking Octopamine
J. Neurosci., June 15, 1996; 16(12): 3900 - 3911.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 1993