Estudo morfofuncional, em nivel mesoscopico, da transição faringo-esofagica no homem adulto

AUTOR(ES)
DATA DE PUBLICAÇÃO

1991

RESUMO

The aim of this study was to reaxamine at, the mesoscopic and microscopic levels, the structure and relationships of the tissues of the pharingo-esophageal transitions in adult man. This regions is the site of some pathologies, among which the most frequent is the Zenker?s diverticulum. Thirty five pieces of the regions were removed from cadavers fixed in 10% formaldehyde and 16 of them were carefully dissected under magnifying glass and stereomicroscope for description of the arrangement of the muscle fibers in the muscular coat. Thirteen pieces were dehydrated being 5 embedded in paraffin and 8 in celloidin, 15`mu´ -thick paraffin and 70`mu´ thick celloidin serial sections were stained with either HE, Picrosirius and Heidenhain s-Azan for collagen fibers and Weigest-Moore fuchsin-resorcin for elastic fibers. Some unstained paraffin sectors were examined under polarizing light, microscope. In the last 6 pieces the adventicia and the submucosa coats were stripped off, stained with either and mounted `in totum´. The elastic and collagen fibers form a net with tight mestres of variable size, being more or less concentric in the adventicia and submucosa coats. At the muscular layer collagen fibers wrap each muscle fiber, assembling them in bundles. The most conspicuous feature of the muscular coat was shown in the region of Laimer s triangle, where longitudinal muscle fibers are interposed in alternate layers with the circular ones. Such arrangement may be useful to strengthen this region , where the Zenker s diverticulum usually occurs

ASSUNTO(S)

esofago anatomia aparelho digestivo faringe

ACESSO AO ARTIGO

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