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Titolo:
Quantitative ultrastructure of slowly adapting lingual afferent terminals in the principal and oral nuclei in the cat
Autore:
Zhang, LF; Moritani, M; Honma, S; Yoshida, A; Shigenaga, Y;
Indirizzi:
Osaka Univ, Grad Sch Dent, Dept Oral Anat & Neurobiol, Suita, Osaka 5650871, Japan Osaka Univ Suita Osaka Japan 5650871 urobiol, Suita, Osaka 5650871, Japan
Titolo Testata:
SYNAPSE
fascicolo: 2, volume: 41, anno: 2001,
pagine: 96 - 111
SICI:
0887-4476(200108)41:2<96:QUOSAL>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRIGEMINAL MOTOR NUCLEUS; JAW-MUSCLE-SPINDLE; TRANSMITTER RELEASE EFFICACY; STEM SUBNUCLEUS INTERPOLARIS; HORSERADISH-PEROXIDASE; SYNAPTIC CONNECTIONS; BRAIN-STEM; PREMOTOR INTERNEURONS; SPINAL-CORD; FUNCTIONAL-CHARACTERISTICS;
Keywords:
synapse; morphometry; intra-axonal; horseradish peroxidase;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Shigenaga, Y Osaka Univ, Grad Sch Dent, Dept Oral Anat & Neurobiol, 1-8 Yamadaoka, Suita, Osaka 5650871, Japan Osaka Univ 1-8 Yamadaoka Suita Osaka Japan 5650871 871, Japan
Citazione:
L.F. Zhang et al., "Quantitative ultrastructure of slowly adapting lingual afferent terminals in the principal and oral nuclei in the cat", SYNAPSE, 41(2), 2001, pp. 96-111

Abstract

Previous studies provide evidence that a structure/function correlation exists in the cytoarchitectonically different zones of the trigeminal sensorynuclei. To extend this relationship, we examined the ultrastructural features of trigeminal primary afferent neurons in the cat dorsal principal nucleus (Vpd) and the rostrodorsomedial oral nucleus (Vo.r) using intra-axonal labeling with horseradish peroxidase and morphometric analyses. All labeledboutons contained round synaptic vesicles. Eighty-two percent of the boutons in the Vo.r and 99% of the boutons in the Vpd were presynaptic to nonprimary dendrites. The remaining boutons in the Vo.r were presynaptic to somata (8%) or primary dendrites (10%). The average number of postsynaptic profiles per labeled bouton did not differ in the Vpd and Vo.r. Most labeled boutons in the two nuclei were postsynaptic to unlabeled axon terminals with pleomorphic vesicles (p-ending). The number of p-endings per labeled bouton was higher in the Vpd than Vo.r A morphometric analysis indicated that labeled bouton volume and apposed surface area were larger in the Vpd than Vo.rwhile active zone area and vesicle number did not differ. All these parameters were larger than those of p-endings in each nucleus. In both labeled boutons and p-endings, the parameters were positively correlated with boutonsize. These results suggest that sensory information conveyed through trigeminal afferents is more strongly controlled at the level of the first synapse by presynaptic mechanisms in the Vpd than in the Vo.r, while the efficacy of transmission at primary afferent synapses does not differ. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/02/20 alle ore 14:49:44