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AuthorSmarandache, Carmen R.dc.contributor.author
Date of accession2016-03-14T13:39:47Zdc.date.accessioned
Available in OPARU since2016-03-14T13:39:47Zdc.date.available
Year of creation2007dc.date.created
AbstractFor an appropriate interaction with the environment, animals process sensory information with their nervous system. One well suited model systems for the investigation of neural processing is the stomatogastric nervous system (STNS) of the crab, Cancer pagurus. It is attached to the crab foregut and controls the movement of food throughout the foregut. It generates the pyloric rhythm, which is responsible for the filtering of food, and the gastric mill rhythm (GMR), which controls the movement of three internal teeth. These rhythms are modulated by the activity of descending projection neurons (Norris et al., 1994; Blitz et al., 1999; Nusbaum et al., 1992; Norris et al., 1996) and they are influenced by sensory feedback (Beenhakker et al., 2004; Combes et al., 1995; Katz & Harris-Warrick, 1991). In this work I characterized the influence of the sensory cell AGR (anterior gastric receptor) on the pyloric and gastric mill rhythms. AGR has a bipolar cell body and is located in the stomatogastric ganglion. It could be activated during an increase of tension of the gastric muscle gm1. AGR possessed at least two spike initiation zones. It was spontaneous active with low firing frequencies and displayed different active membrane properties. When AGR was activated with current injections, it diminished the activity of two pyloric neurons and prolonged the pyloric cycle period. It also effected the gastric mill rhythm by exciting the protractor motor neurons and inhibiting the retractor motor neuron. When a gastric mill rhythm was active, rhythmic AGR stimulation entrained this rhythm to faster or slower periods (up to 60 %). In addition, a single AGR stimulus could reset the gastric mill rhythm at any time of the gastric phase. The actions of AGR on both rhythms were elicited via a change in projection neuron activity. I characterized the interactions between AGR and four identified projection neurons. In addition, I activated AGR in closed loop conditions such that motor neurons and AGR could interact. These experiments demonstrated the importance of an appropriate timing of sensory feedback. Thus, for a general understanding of sensorimotor interaction, the processing of sensory information in higher neural centers is of critical importance.dc.description.abstract
Languagededc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandard (Fassung vom 03.05.2003)dc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v1dc.rights.uri
KeywordProjektionsneuronedc.subject
KeywordZentrale Mustergeneratorendc.subject
Dewey Decimal GroupDDC 570 / Life sciencesdc.subject.ddc
TitleDer Einfluss eines Muskelsehnenorgans auf modulatorische Projektionsneurone und zentrale Mustergeneratoren im stomatogastrischen Nervensystem des Taschenkrebsesdc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-507dc.identifier.doi
PPN611764865dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-59684dc.identifier.urn
GNDPropriorezeptordc.subject.gnd
GNDStomatogastrisches Nervensystemdc.subject.gnd
GNDTaschenkrebsdc.subject.gnd
FacultyFakultät für Naturwissenschaftenuulm.affiliationGeneral
Date of activation2007-07-23T13:59:45Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionZ: J-H 11.527 ; W: W-H 9.733uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS ID5968uulm.vtsID
CategoryPublikationenuulm.category
Bibliographyuulmuulm.bibliographie


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