. Compendium of histology. Histology. Fig. 60.—Lacunas (</, a) with their numerous offshoots, opening into the transversely divided Haversian canal {V- produced by two human hands when their volar surfaces rest over each other. The length is to , the breadth to , tne thickness to mm. The offshoots of this system of cavities, very nar- row canals of to mm. diameter, permeate the entire tissue in innumerable multitudes, ramifying irregularly in a radial direction. They open (1) in the Haversian canals {b), (2) on the surface of the bone, an
. Compendium of histology. Histology. Fig. 60.—Lacunas (</, a) with their numerous offshoots, opening into the transversely divided Haversian canal {V- produced by two human hands when their volar surfaces rest over each other. The length is to , the breadth to , tne thickness to mm. The offshoots of this system of cavities, very nar- row canals of to mm. diameter, permeate the entire tissue in innumerable multitudes, ramifying irregularly in a radial direction. They open (1) in the Haversian canals {b), (2) on the surface of the bone, and (3) in the large medullary cavity in the interior. Transverse and longitudinal sections (the tan- gential must also be added) teach this most distinctly. In the dried bone, the marvellously complicated system of canaliculi has become filled with air in a condition of the finest division. An earlier epoch erroneously assumed the contents to be inorganic hardening material, to be the finest molecules of the so-called bone earths. Hence the name of the " calcareous ; If we place the small thin plate in turpentine oil, the thousands upon thousands of finest canali- culi rapidly fill with the fluid through capillary attraction. The bone corpuscle now presents the appearance of a cavity; the fine canaliculi disappear more or less in the basis sub- ^=^ stance. But what does this remarkable canal work contain during life ? We answer to this, there is in the lacunae a protoplasmatic membraneless cell (Fig. 61, b). Whether this bone cell, the equivalent of the connective-tissue corpuscle, sends off capillary offshoots into the lacunae, which is very prob- able, we do not yet know. The latter canalic- ular system is certainly filled with transuded blood plasma. This fluid must, besides, be rather stagnant, for the frictional. Fig. 61.—From the fresh ethmoid bone of the mouse; a. basis substance; t, the bone Please note that these images are extracted from
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