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Titolo:
LIGHT-MICROSCOPIC OBSERVATIONS OF THE CONTACTS MADE BETWEEN 2 SPINDLEAFFERENT TYPES AND ALPHA-MOTONEURONS IN THE CAT TRIGEMINAL MOTOR NUCLEUS
Autore:
YABUTA NH; YASUDA K; NAGASE Y; YOSHIDA A; FUKUNISHI Y; 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: 3, volume: 374, anno: 1996,
pagine: 436 - 450
SICI:
0021-9967(1996)374:3<436:LOOTCM>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
RHYTHMICAL JAW MOVEMENTS; RECURRENT AXON COLLATERALS; HIND-LIMB MUSCLES; HORSERADISH-PEROXIDASE; SPINAL-CORD; GAMMA-MOTONEURONS; TIME COURSE; INTRACELLULAR ANALYSIS; MESENCEPHALIC NUCLEUS; CONDUCTION-VELOCITY;
Keywords:
JAW-MUSCLE; SYNAPTIC CONTACT; STRETCH REFLEX; HRP; INTRACELLULAR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
71
Recensione:
Indirizzi per estratti:
Citazione:
N.H. Yabuta et al., "LIGHT-MICROSCOPIC OBSERVATIONS OF THE CONTACTS MADE BETWEEN 2 SPINDLEAFFERENT TYPES AND ALPHA-MOTONEURONS IN THE CAT TRIGEMINAL MOTOR NUCLEUS", Journal of comparative neurology, 374(3), 1996, pp. 436-450

Abstract

Previous studies indicate that cat jaw-muscle spindle afferents can be divided into two types (type I and II) on the basis of their axonal trajectories. The present study examined the relationship between spindle afferent fibers and their target masseter cy-motoneurons in the cat by using the intracellular horseradish peroxidase (HRP) injection technique, and provided several new findings on the synaptic organization generated between the two. Five type I afferent fiber-motoneuron pairs and nine type II afferent-motoneuron pairs were well stained with HRP. The following conclusions were drawn: 1) A motoneuron received contacts from only one collateral of any given spindle afferent. 2) The number of contacts made between an afferent and a motoneuron ranged from one to three. 3) The contacts made by a spindle afferent were on thesame dendrite or dendrites branching from the same primary dendrite. 4) The vast majority of the contacts made by an afferent on a motoneuron were distributed in the dendritic tree within 600 mu m from the soma, i.e., in the proximal three fourths of the dendritic tree. The differences observed between the two afferent types were as follows. First, type II afferent terminals made contacts on more distal dendrites ofthe motoneurons than did type I afferent terminals. Second, the contacts made between a type I afferent and a motoneuron were clustered together, but those made between a type II afferent and a motoneuron werewidely dispersed. The present results provided the general rules of synaptic contacts between the spindle afferents and masseter a-motoneurons, and demonstrated that the spatial distribution of synaptic contacts on the dendritic tree was different between type I and type II afferents. (C) 1996 Wiley-Liss, Inc.

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Documento generato il 27/09/20 alle ore 00:26:50