Synaptic organization of the interstitial subdivision of the nucleus tractus solitarii and of its laryngeal afferents in the rat

The Journal of Comparative Neurology
A Mrini, A Jean

Abstract

The nucleus tractus solitarii, the first central relay for gustatory and a variety of visceral afferents, is also an integrative center for numerous functions. Its interstitial subdivision is involved in swallowing and respiratory reflexes. The ultrastructural characteristics of this subdivision and of its laryngeal afferents were investigated in adult rat by a serial-section study and by application of wheat germ agglutinin-horseradish peroxidase conjugate to the peripheral afferent fibers. The interstitial subnucleus contained scattered small neuronal cell bodies with such ultrastructural features as a large nucleus with deep indentations and an organelle-poor cytoplasm. On the basis of their size and vesicular content, the axon terminals were classified into three categories. Group I and group II terminals were small or large, respectively, and contained mainly small, round, and clear synaptic vesicles. Group III terminals were also small but contained small, pleomorphic, and clear vesicles. Axodendritic synapses were the most numerous. They were either asymmetrical, comprised of group I and II terminals, or symmetrical, comprised of group III terminals. More than 50% were part of complex synaptic arrangements in the form of...Continue Reading

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Citations

Oct 24, 2000·The Journal of Comparative Neurology·C De La Roza, F Reinoso-Suárez
Jun 2, 2005·Respiratory Physiology & Neurobiology·Christy L Ludlow
Mar 10, 2001·Respiration Physiology·D Jordan
Jun 24, 2004·Journal of Neurophysiology·Ranjinidevi AmbalavanarChristy L Ludlow
Jul 25, 2012·Experimental Gerontology·Xin FengStephen B Kritchevsky
May 15, 2001·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·A Sawczuk, K M Mosier
Jun 24, 1999·The Journal of Comparative Neurology·R AmbalavanarC L Ludlow
Mar 6, 2002·Journal of Neurophysiology·Ranjinidevi AmbalavanarChristy L Ludlow

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