Locomotion evoked by stimulation of the brain stem in the Atlantic Stingray, Dasyatis sabina.

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dc.acquisition-srcen_US
dc.call-noAcc# 1533en_US
dc.contract-noen_US
dc.contributor.authorLivingston, C.A.en_US
dc.contributor.authorLeonard, R.B.en_US
dc.contributor.otherJournal of Neuroscience.en_US
dc.date.accessioned2010-02-15T16:50:55Z
dc.date.available2010-02-15T16:50:55Z
dc.date.issued1990en_US
dc.degreeen_US
dc.descriptionp. 194-204.en_US
dc.description-otheren_US
dc.description.abstractThe primary pathway descending to the spinal cord to initiate locomotion in the stingray is located in the intermediate to ventral portion of the lateral funiculus; a second pathway is located in the dorsolateral funiculus. The goal of this study was to identify the origins of these pathways in the rhombencephalic reticular formation (RF). To do this we used microstimulation of the RF in conjunction with selective lesions of the brain stem and spinal cord. In some animals microinjections of excitatory amino acids were used to avoid stimulating axons of passage. Locomotion in the contralateral pectoral fin was evoked by microstimulation of the dorsal and ventral reticular nuclei, the middle and superior RF, and the ventral portion of the lateral RF. The regions from which locomotion was evoked by chemical stimulation were more restricted and included the rostral dorsal reticular nucleus, the middle RF, and the adjacent ventral lateral RF. This area incompasses the magnocellular RF and coincides with the distribution of numerous reticulospinal cells that project ipsilaterally into the ventral half of the lateral funiculus. Our results indicate, then , that locomotion in the stingray is mediated primarily by a pathway originating in the magnocellular RF that descends ipsilaterally in the ventral half of the lateral funiculus to elicit swimming in the contralateral pectoral fin. We suggest that this primary pathway is specifically associated with the control of locomotion. We also demonstrated that locomotion can be evoked independently from the lateral RF, but is probably mediated by an indirect pathway relaying near the spinomedullary junction or in the rostral spinal cord.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeTexas coasten_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/19296
dc.latitudeen_US
dc.locationGBIC Collection file roomen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries1533.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectAtlantic stingrayen_US
dc.subjectDasyatis sabinaen_US
dc.subjectneurophysiologyen_US
dc.subjectmarine fishen_US
dc.titleLocomotion evoked by stimulation of the brain stem in the Atlantic Stingray, Dasyatis sabina.en_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue10(1)en_US

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