. Compendium of histology. Histology. 62 SIXTH 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 surf
. Compendium of histology. Histology. 62 SIXTH 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit
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