RESUMO -A anatomia funcional das granulacões aracnóides do seio sagital superior foi estudada por técnicas micro-mesoscópicas a fim de contribuir para esclarecimentos de vias de drenagem do liqüido cerebrospinal através de seus componentes fibrosos. A disposição dos elementos fibrosos foi analisada na base do pedículo, pedículo, centro e ápice da granulação. A análise dos cortes seriados mostra na base do pedículo, malhas de colágeno com morfologia predominantemente circular orientando-se longitudinalmente no sentido do maior eixo do pedículo. Estes feixes emergem no centro da granulação, ramificando-se a seguir em direção ao ápice e à periferia da granulação.Os feixes elásticos possuem disposição semelhante à descrita para feixes colágenos e delimitam, com estes, canais intercomunicantes desde a base do pedículo ao ápice da granulação. Encontramos, na base do pedículo, feixes de fibras reticulares dispostos entre as malhas de colágeno. A cápsula fibrosa da granulação encontra-se constituída de feixes colágenos e de pequena quantidade de fibras elásticas.A micromesoscopic study of human arachnoid granulations.SUMMARY -The functional anatomy of the arachnoid granulations of the upper sagittal sinus was studied by means of micromesoscopic techniques in order to contribute to elucidating aspects of drainage pathways of the cerebrospinal fluid through their fibrous components. The arrangement of fibrous elements was analysed at the base of the peduncle, peduncle, middle and apex of granulation. The analysis of seriate sections shows collagen bundles at the base of the peduncle with a predominantly circular morphology, longitudinally directed towards the peduncle's longest axis. These bundles arise in the middle of the granulation, them branch off towards its apex and periphery.The elastic bundles present an arrangement similar to that described for collagen bundles, delimiting with such bundles intercommunication channels from the base of the peduncle up to the apex of the granulation. Bundles of reticular fibers arranged in between the collagen meshes were found at the base of the peduncle. The fibrous capsule of granulation is ccmposed of collagen bundles and a small number of elastic fibers.
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