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Titolo:
ULTRASTRUCTURAL OBSERVATIONS OF SYNAPTIC CONNECTIONS OF VIBRISSA AFFERENT TERMINALS IN CAT PRINCIPAL SENSORY NUCLEUS AND MORPHOMETRY OF RELATED SYNAPTIC ELEMENTS
Autore:
NAKAGAWA S; KURATA S; YOSHIDA A; NAGASE Y; MORITANI M; TAKEMURA M; BAE YC; SHIGENAGA Y;
Indirizzi:
OSAKA UNIV,FAC DENT,DEPT ORAL ANAT,1-8 YAMADAOKA SUITA OSAKA 565 JAPAN OSAKA UNIV,FAC DENT,DEPT ORAL ANAT SUITA OSAKA 565 JAPAN
Titolo Testata:
Journal of comparative neurology
fascicolo: 1, volume: 389, anno: 1997,
pagine: 12 - 33
SICI:
0021-9967(1997)389:1<12:UOOSCO>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
STEM SUBNUCLEUS INTERPOLARIS; TRIGEMINAL PRIMARY AFFERENTS; MUSCLE-SPINDLE AFFERENTS; LUMBOSACRAL SPINAL-CORD; LOBSTER NEUROMUSCULAR TERMINALS; SUBSTANTIA GELATINOSA GLOMERULI; TRANSMITTER RELEASE EFFICACY; MOTOR-NERVE TERMINALS; GROUP-IA AFFERENTS; DORSAL-ROOT AXONS;
Keywords:
SYNAPTIC BOUTON; SIZE PRINCIPLE; TRIGEMINAL; INTRAAXONAL; HRP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
93
Recensione:
Indirizzi per estratti:
Citazione:
S. Nakagawa et al., "ULTRASTRUCTURAL OBSERVATIONS OF SYNAPTIC CONNECTIONS OF VIBRISSA AFFERENT TERMINALS IN CAT PRINCIPAL SENSORY NUCLEUS AND MORPHOMETRY OF RELATED SYNAPTIC ELEMENTS", Journal of comparative neurology, 389(1), 1997, pp. 12-33

Abstract

Previous work. suggests that slowly adapting (SA) periodontal afferents have different synaptic arrangements in the principal (Vp) and oraltrigeminal nuclei and that the synaptic structure associated with transmitter release may be related directly to bouton size. The present study examined the ultrastructures of SA and fast adapting (FA) vibrissa afferents and their associated unlabeled axonal endings in the cat Vp by using intra-axonal labeling with horseradish peroxidase and a morphometric analysis. All SA and FA afferent boutons contained clear, round, synaptic vesicles. All the FA and most SA boutons were presynaptic to dendrites, but a few SA boutons were axosomatic. Both types of bouton were frequently postsynaptic to unlabeled axonal ending(s) containing pleomorphic, synaptic vesicles (P-ending). The size of labeled boutons was larger in FA than SA afferents, but the size of dendrites postsynaptic to labeled boutons was larger for SA than FA afferents. Large-sized FA and SA boutons made synaptic contacts with small-diameter dendrites. The size of FA and SA boutons was larger than that of theirassociated P-endings. A morphometric analysis made on the pooled dataof SA and FA boutons indicated that apposed surface area, active zonenumber, total active zone area, vesicle number, and mitochondrial volume were highly correlated in a positive linear manner with labeled bouton volume. These relationships were also applicable to unlabeled P-endings, but the range of each parameter was smaller than that of the labeled boutons. These observations provide evidence that the two functionally distinct types of vibrissa afferent manifest unique differences but share certain structural features in the synaptic organization and that the ultrastructural ''size principle'' proposed by Pierce and Mendell ([1993] J. Neurosci. 13:4748-4763) for Ia-motoneuron synapses is applicable to the somatosensory system. (C) 1997 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 03:38:32