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Ultrastructure of the myelinated and unmyelinated nerve fibers of the tongue mucosa of albinus rat (Wistar) with aging / Ultraestructura de las Fibras Nerviosas Mielínicas y Amielínicas de la Mucosa Lingual de ratas Albinas (Wistar) Envejecidas
Grisolia, D. F; Ogawa, K; Motoyama, A. A; Kronka, M. C; Carneiro Júnior, J. T; Duro, C. C; Watanabe, I.
  • Grisolia, D. F; University of São Paulo. Institute of Biomedical Sciences. Department of Anatomy. BR
  • Ogawa, K; University of Fukuoka. School of Medicine. Department of Anatomy. JP
  • Motoyama, A. A; University of São Paulo. Institute of Biomedical Sciences. Department of Anatomy. BR
  • Kronka, M. C; University of São Paulo. Institute of Biomedical Sciences. Department of Anatomy. BR
  • Carneiro Júnior, J. T; University of São Paulo. Institute of Biomedical Sciences. Department of Anatomy. BR
  • Duro, C. C; University of São Paulo. Institute of Biomedical Sciences. Department of Anatomy. BR
  • Watanabe, I; University of São Paulo. Institute of Biomedical Sciences. Department of Anatomy. BR
Int. j. morphol ; 24(3): 407-412, sept. 2006. ilus, graf
Article in English | LILACS | ID: lil-474604
Responsible library: CL1.1
RESUMEN
El objetivo de esta investigación fue estudiar las fibras sensitivas mielinizadas y amielínicas localizadas en la lámina propia subepitelial de la mucosa lingual de ratas. Se usó el método de impregnación argéntica, microscopía MET y mediciones morfométricas. Los resultados revelaron que los fascículos de fibras subepiteliales de las regiones anterior, media y posterior de la lengua provenían de su capa muscular profunda. Los grupos de fibras fueron localizados dentro del tejido conectivo de la lámina propia. Estas fibras nerviosas se ramificaron varias veces y en el tejido conectivo de las papilas formaron terminaciones simples o ramificados. Las papilas fungiformes y valadas contenían numerosas terminaciones nerviosas. La ultraestructura demostró en el axoplasma la presencia de neurofilamentos, mitocondrias y microtúbulos; aunque los registros morfométricos de las fibras mielinizadas mostraron que alrededor del 44 por ciento tenían un diámetro entre 3 y 4 µm, el valor promedio fue de 4.5 µm. El diámetro mayor fue de 12 µm y el menor de 1.4 um. Los rangos de menores diámetros fueron de 1 a 3 µm, siendo el promedio de 2.33 µm. En relación al espesor de las vainas de mielina, los valores obtenidos fueron de 0.2 a 0.8 um siendo el valor promedio de alrededor de 0,5 µm, en el 90 por ciento de ellas. En las fibras amielínicas los mayores diámetros (62 por ciento) variaron entre 0.25 y 0.75 µm. El valor promedio fue de 0.6 µm, siendo el valor máximo 3.17 µm y el mínimo 0.2 µm. El menor diámetro fue obtenido en 44 por ciento de las fibras amielínicas y los rangos variaron entre 0.2 y 0.4 µm. El valor máximo obtenido fue de 1 µm y el mínimo 0.12 µm.
ABSTRACT
The purpose of this paper was to study the sensory myelinated and unmyelinated nerve fibers found in the subepithelial lamina propria of tongue mucosa of aging rats. It was used the silver impregnation, transmission electron microscopy methods and morphometric measurements. The results revealed that subepithelial nerve fiber bundles of the anterior, medium and posterior regions of tongue were arise from deep muscular layer of tongue. The nerve fiber bundles were verified inside of the connective tissue of lamina propria. These nerve fibers branched several times and into the connective tissue papillae they form a single or ramified sensory nerve endings. The fungiform and vallate papillae contain numerous nerve terminals. The fine structure demonstrated that in the axoplasm were noted the presence of neurofilaments, mitochondria and microtubules. Although the morphometric data of myelinated fibers showed that about 44% having larger diameter between 3 to 4 µm and the mean value was 4.5 µm. The largest diameter was 12 µm and the smaller was 1.4 um. The smallest diameter ranges from 1 to 3 µm, being that the mean value was 2.33 µm. Concerning to the thickness of myelin sheets were revealed the values ranging from 0.2 to 0.8 µm being that the 90% present the values around 0.5 µm. The unmyelinated fibers showed the largest diameter (62%) varying from 0.25 to 0.75 µm. The mean value was 0.6 µm being the maximum value was 3.17 µm and the minimum was 0.2 µm. The smallest diameter was obtained in 44% of unmyelinated fibers which the diameter ranges from 0.2 to 0.4 µm.Then maximum value obtained was 1 µm and the minimum was 0.12 µm.
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Nerve Fibers, Unmyelinated / Mouth Mucosa / Nerve Fibers, Myelinated Limits: Animals Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2006 Type: Article Affiliation country: Brazil / Japan Institution/Affiliation country: University of Fukuoka/JP / University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Nerve Fibers, Unmyelinated / Mouth Mucosa / Nerve Fibers, Myelinated Limits: Animals Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2006 Type: Article Affiliation country: Brazil / Japan Institution/Affiliation country: University of Fukuoka/JP / University of São Paulo/BR