[The structure of meningeal granules based on light- and scanning electron microscopic studies]. / Beitrag zum Bau der Granula meningica auf Grund lichtmikroskopischer und rasterelektronenmikroskopischer Untersuchungen

ABSTRACT

The granula meningica of man (medium and advanced age) were investigated by means of light microscopy and scanning electron microscopy. We established the following 1. The endothel of the sinus durae matris of man only seldom shows the blind tubes of endothel which were described by Andres (1967)1 after investigations made in cats and dogs. 2. a) There are no tube systems lined with mesothelial cells in the tissue of the granula meningica. Usually the cellcords and cellclusters are solid. Only in exceptional cases do they have a cavity. b) There are wide spaces between the collagen fibrebundles. These spaces are filled with a thinly liquid amorphous ground substance. We observed many free cells there (especially macrophages). 3. The construction of the connective tissue of the granula meningea lead us to conclude, that they are capable of changing their volume and shape considerably. The possible functional consequences of these results were discussed.