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The action of the eyecup muscles of the crab, Carcinus, during optokinetic movements

Burrows, M.; Horridge, George Adrian

Description

Summary 1. The actions of the nine eyecup muscles of the crab during horizontal optokinetic movements are described. 2. Each muscle includes a wide spectrum of fibre types, ranging from phasic, with sarcomere lengths of 3-4 µm., through intermediate, to tonic fibres with sarcomeres of 10-12 µm. Each muscle receives at least one slow and one fast motoneuron, but no inhibitory supply. The slow axons predominantly innervate the tonic muscle fibres while the fast axons innervate the phasic...[Show more]

dc.contributor.authorBurrows, M.
dc.contributor.authorHorridge, George Adrian
dc.date.accessioned2019-09-17T02:44:32Z
dc.date.available2019-09-17T02:44:32Z
dc.identifier.issn0022-0949
dc.identifier.urihttp://hdl.handle.net/1885/170485
dc.description.abstractSummary 1. The actions of the nine eyecup muscles of the crab during horizontal optokinetic movements are described. 2. Each muscle includes a wide spectrum of fibre types, ranging from phasic, with sarcomere lengths of 3-4 µm., through intermediate, to tonic fibres with sarcomeres of 10-12 µm. Each muscle receives at least one slow and one fast motoneuron, but no inhibitory supply. The slow axons predominantly innervate the tonic muscle fibres while the fast axons innervate the phasic ones. 3. Slow movement and the position of the eyecup in space are controlled by the frequency of slow motoneuron discharges. All muscles collaborate at every position. The phasic system is recruited during rapid eyecup movements of large amplitude. 4. In optokinetic nystagmus the exact form of the impulse sequences are described for each muscle. They are the consequence of a visually driven central programme which takes no account of the movement which it generates. Movements in opposite directions involve different central programmes; the one is not merely the reverse of the other. There is no effective proprioceptive feedback from the eyecup joint or from muscle tension receptors.
dc.format.extent28 pages
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherCompany of Biologists
dc.rights© 1968 The Company of Biologists Ltd
dc.sourceJournal of Experimental Biology
dc.subjecteyecup muscle
dc.subjectcrab Carcinus
dc.subjectoptokinetic movement
dc.subjectnine
dc.subjectaxon
dc.subjectslow
dc.subjectreceptor
dc.titleThe action of the eyecup muscles of the crab, Carcinus, during optokinetic movements
dc.typeJournal article
local.description.notesAt the time of publication the author was affiliated with the Gatty Marine Laboratory and Department of Natural History University of St Andrews, Scotland.
local.identifier.citationvolume49
dc.date.issued1968-10-01
local.publisher.urlhttps://www.biologists.com/
local.type.statusPublished Version
local.contributor.affiliationHorridge, George Adrian, Division of Biomedical Science and Biochemistry, CoS Research School of Biology, The Australian National University
local.identifier.essn1477-9145
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage223
local.bibliographicCitation.lastpage250
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0022-0949/ Author can archive publisher's version/PDF. Publisher's version/PDF may be used (Sherpa/Romeo as of 17/9/2019)
CollectionsANU Research Publications

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