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Titolo:
THE SPINAL-CORD OF GYMNOTUS-CARAPO - THE ELECTROMOTONEURONS AND THEIRPROJECTION PATTERNS
Autore:
CAPUTI A; TRUJILLOCENOZ O;
Indirizzi:
INST INVEST BIOL CLEMENTE ESTABLE,DIV COMPARAT NEUROANAT,CP 11600 AVEITALIA 3318 MONTEVIDEO URUGUAY
Titolo Testata:
Brain, behavior and evolution
fascicolo: 3, volume: 44, anno: 1994,
pagine: 166 - 174
SICI:
0006-8977(1994)44:3<166:TSOG-T>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRIC ORGAN DISCHARGE; WAVEFORM GENERATION; MECHANISMS;
Keywords:
SPINAL CORD; ELECTROMOTONEURONS; SIZE PRINCIPLE; ELECTRIC FISH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
A. Caputi e O. Trujillocenoz, "THE SPINAL-CORD OF GYMNOTUS-CARAPO - THE ELECTROMOTONEURONS AND THEIRPROJECTION PATTERNS", Brain, behavior and evolution, 44(3), 1994, pp. 166-174

Abstract

The electric organ of Gymnotus carapo lies parallel to the spinal cord and extends from the pectoral girdle to the tip of the tail. The spinal electromotoneurons are distributed in a relatively consistent pattern: there is a peak at 17% of the fish's length and an irregular distribution beyond 25%. Horseradish peroxidase injections into the electric organ not exceeding 5% of the fish's length labeled electromotoneuron arrays occupying 20% of the fish's length. Injections made in four discrete rostrocaudal electric organ regions resulted in labeled electromotoneurons distributed along four sequential but overlapping arrays. Since the caudal portion of the spinal cord lacks electromotoneurons, there is a shortened representation of the electric organ. The electromotoneuron population is not homogeneous: there are small neurons (somata 25-40 mu m) and large neurons (somata 45-60 mu m) unevenly distributed along the cord. Small neurons occur at more rostral spinal cordsegments, while large neurons lie in more caudal segments. Both kindsof nerve cells coexist in the intermediate regions. Overlapping of subsequent neuronal arrays favors synchronized firing of electrocytes. The presence of two neuronal populations differing in size and projecting to opposite electrocyte faces may account for the timed excitation of the electrogenic surfaces. Taking into account these new findings acomprehensive explanation of the activation sequence along the spinalcord and the electric organ is proposed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:29:50