Das Wesen der Mandlschen Körperchen in den Teleosteerschuppen, ein Beitrag zum Verständnis der Kalkabscheidung bei der Bildung knochenartiger Gewebe

Abstract

After a historical introduction, the author refers to his polariscopic investigations of Mandl''s corpuscles in Gadus vireus and several Cyprinidae, in the course of which he confirmed the old idea of Baudelot concerning the calco-spherite (Ca hydrous aluminum phosphate) nature of these bodies. Mandl''s corpuscles, which are embedded in the lamellae of the basal layer of the teleost dermal scale, are elliptical; through superposition of such corpuscles there arise cross-shaped, hexagonal or almost rectangular formations. In its longitudinal direction each corpuscle shows parallel fibration and appears striated. This fibration runs parallel with the particular lamella in which the corpuscle lies. Mandl''s corpuscle represent calcareous and fibrous parts of such lamellae and either are separated from surrounding structures by gas-filled crevices or uncalcified interstitial substance or are fused without a seam with the calcified surroundings. The study closes with a report on double-refraction in polariscopic investigations of Mandl''s corpuscle in air, balsam and cinnamic aldehyde, the results of which permit the conclusion that the lime crystallites have a disk-shaped, spherical arrangement in contrast to the globules of the human dentin which are complete spheres distinguishable from Mandl''s corpuscles by their size and possibility of 3-dimensional growth.