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Titolo:
SEGMENTAL AND PROPRIOSPINAL PROJECTION SYSTEMS OF FROG LUMBAR INTERNEURONS
Autore:
SCHOTLAND JL; TRESCH MC;
Indirizzi:
BOSTON UNIV,DEPT HLTH SCI,ROOM 427,635 COMMONWEALTH AVE BOSTON MA 02215 MIT,DEPT BRAIN & COGNIT SCI CAMBRIDGE MA 02139
Titolo Testata:
Experimental Brain Research
fascicolo: 2, volume: 116, anno: 1997,
pagine: 283 - 298
SICI:
0014-4819(1997)116:2<283:SAPPSO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPINAL-CORD TRANSECTION; CONJUGATED HORSERADISH-PEROXIDASE; RETROGRADE TRANSPORT; RUBROSPINAL NEURONS; SPINODELTOIDEUS MOTONEURONS; TRANSNEURONAL TRANSPORT; ANATOMICAL ORGANIZATION; SYNAPTIC ACTIVITY; TRACT NEURONS; NEONATAL RAT;
Keywords:
MOTOR SYSTEMS; NEURAL NETWORKS; SPINAL CORD; HORSERADISH PEROXIDASE; RANA PIPIENS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
61
Recensione:
Indirizzi per estratti:
Citazione:
J.L. Schotland e M.C. Tresch, "SEGMENTAL AND PROPRIOSPINAL PROJECTION SYSTEMS OF FROG LUMBAR INTERNEURONS", Experimental Brain Research, 116(2), 1997, pp. 283-298

Abstract

Spinal interneuronal networks have been implicated in the coordination of reflex behaviors and limb postures in the spinal frog. As a firststep in defining these networks, retrograde transport of horseradish peroxidase (HRP) was used to examine the anatomical organization of interneuronal circuitry in the lumbar spinal cord of the frog. Followingneuronal degeneration induced by spinal transection and section of the dorsal and ventral roots, HRP was placed at different locations in the spinal cord and the positions of labeled neuronal cell bodies plotted using a Eutectics Neuron Tracing System. We describe four spinal interneuronal systems, three with cell bodies located in the lumbar cordand one with descending projections to the lumbar cord. Interneurons with cell bodies located in the lumbar cord include: (1) Lumbar neurons projecting rostrally. Those projecting to thoracic segments tended to be located in the lateral and ventrolateral gray and in the lower two-thirds of the dorsal horn, with projections that were predominantly uncrossed. Those projecting to the brachial plexus and beyond were located in the dorsal part of the dorsal horn (uncrossed) and in the lateral, ventrolateral, and ventromedial gray (crossed). (2) Lumbar neurons with segmental projections within the lumbar cord. These neurons, which were by far the most numerous, had both uncrossed and crossed projections and were distributed throughout the dorsal, lateral, ventrolateral, and ventromedial gray matter. (3) Lumbar neurons projecting to the sacral cord. This population, which arose mainly from the dorsal horn and lateral or ventrolateral gray, was much smaller than in the ether systems. Neuronal density of some of these populations of lumbar interneurons appeared to vary with rostrocaudal level. Finally, a population of neurons with cell bodies in the brachial and thoracic segmentsthat projects to the lumbar cord is described. The most rostral of these neurons were multipolar cells with uncrossed projections, while those with crossed projections were confined almost exclusively to the ventral half of the cord. The distribution of spinal interneurons reported here will provide guidance for future studies of the role of interneuronal networks in the control of movements using the spinal frog asa model system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 00:47:55