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The organization of the motoneurons innervating the axial musculature of vertebrates. I. Goldfish ( Carassius auratus ) and mudpuppies ( Necturus maculosus )

dc.contributor.authorFetcho, Joseph R.en_US
dc.date.accessioned2007-04-06T18:19:47Z
dc.date.available2007-04-06T18:19:47Z
dc.date.issued1986-07-22en_US
dc.identifier.citationFetcho, Joseph R. (1986)."The organization of the motoneurons innervating the axial musculature of vertebrates. I. Goldfish ( Carassius auratus ) and mudpuppies ( Necturus maculosus )." The Journal of Comparative Neurology 249(4): 521-550. <http://hdl.handle.net/2027.42/50029>en_US
dc.identifier.issn0021-9967en_US
dc.identifier.issn1096-9861en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/50029
dc.identifier.urihttp://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=3745506&dopt=citationen_US
dc.description.abstractThe motoneurons innervating different regions of the myomeres in goldfish and mudpuppies were examined by applying HRP to the musculature or to branches of spinal nerves. In goldfish, the populations of motoneurons innervating epaxial or hypaxial muscle occupied similar positions in the motor column and had similar size distributions. There was no relationship between the size or location of a motoneuron in the motor column and the dorsoventral location of the muscle it innervated in the myomeres. Instead, different populations of motoneurons innervated the functionally different red and white musculature. The red muscle was innervated only by small motoneurons that occupied the ventral portion of the motor column. Their small axons passed lateral to the Mauthner axon in the cord, and most of them traveled in a separate branch of each spinal nerve that ran in the horizontal septum to the red muscle. The white muscle was innervated by a population of motoneurons that did not innervate red. They were large and they occupied a characteristic position in the extreme dorsal part of the motor column. Their large axons traveled medial to the Mauthner axon in the cord and entered branches of spinal nerves running deep in the epaxial or hypaxial muscle. The white muscle was probably also innervated by some smaller motoneurons similar to those innervating red; however, these may have been motoneurons whose axons ran through white muscle to reach other muscle. The large motoneurons innervating only white muscle are similar to the primary motoneurons identified in developmental studies in teleosts (Myers: Soc. Neurosci. Abstr. 9: 848, '83); the smaller ones, innervating both red and white, are like secondary motoneurons. Therefore, in goldfish, motoneurons having different morphology and developmental history also innervate different regions in the myomeres. The motor column in mudpuppies was, in general respects, similar to the column in goldfish. There were large primary motoneurons and small secondary ones. Though there were slight differences in the locations of motoneurons filled from nerves entering epaxial and hypaxial muscle, their distributions in the cord overlapped substantially. The motor columns in these two anamniotes differ substantially from the motor columns in those amniotes that have been studied. In amniotes, the motoneurons innervating epaxial and hypaxial muscles are spatially segregated in the cord (Smith and Hollyday: J. Comp. Neurol 220: 16-28, '83; Fetcho: J. Comp. Neurol 249: 551-563, '86). The absence of a comparable segregation in goldfish and mudpuppies implies that the medial motor column has undergone a major reorganization during the evolution of vertebrates.en_US
dc.format.extent3153016 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.publisherWiley Subscription Services, Inc., A Wiley Companyen_US
dc.subject.otherLife and Medical Sciencesen_US
dc.subject.otherNeuroscience, Neurology and Psychiatryen_US
dc.titleThe organization of the motoneurons innervating the axial musculature of vertebrates. I. Goldfish ( Carassius auratus ) and mudpuppies ( Necturus maculosus )en_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelNeurosciencesen_US
dc.subject.hlbtoplevelHealth Sciencesen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDivision of Biological Sciences, The University of Michigan, Ann Arbor, Michigan 48109en_US
dc.identifier.pmid3745506en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/50029/1/902490408_ftp.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1002/cne.902490408en_US
dc.identifier.sourceThe Journal of Comparative Neurologyen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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