Elements of histology (1898) Elements of histology elementsofhistol00klei Year: 1898 72 Elemexts of Histology. bones and in the outer layer of flat and short bones. Its lamell?e are arranged as: («) concentric or Haversian lamella., directly surrounding the Haversian canals (Fig. 51). These are narrow canals of varying lengths pervading the compact substance in a longitudinal a P'ig. 51.—Compact Bone Substance in Cross-section. (Atlas.) a. Concentric lamellae arranged around the Haversian canals, cut across; 6, in- termediate or ground lamellia The bone lacuna? are seen between the bone la
Elements of histology (1898) Elements of histology elementsofhistol00klei Year: 1898 72 Elemexts of Histology. bones and in the outer layer of flat and short bones. Its lamell?e are arranged as: («) concentric or Haversian lamella., directly surrounding the Haversian canals (Fig. 51). These are narrow canals of varying lengths pervading the compact substance in a longitudinal a P'ig. 51.—Compact Bone Substance in Cross-section. (Atlas.) a. Concentric lamellae arranged around the Haversian canals, cut across; 6, in- termediate or ground lamellia The bone lacuna? are seen between the bone lamellas. direction, and anastomosing with one another by transverse or oblique branches. The Haversian canals near the marrow cavity are larger than those near the periosteum. In fact, those next to the marrow cavity become gradually enlarged by absorption of the concentric lamellse, until finally they are fused with the marrow cavity. Each Haversian canal con- tains a blood-vessel, one or two lymphatics, and a variable amount of marrow tissue. These canals open both into the marrow cavity and on the outer surface into the osteogenetic layer of the periosteum, and they form the means by which the latter remains in continuity with the marrow. Each canal is surrounded
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