Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 ORGANIZATION AND DEVELOPMENT OF ANIMALS IN GENERAL. 41 pact intercellular substance, which is also traversed by numerous canals, known as Haversian canals. These contain the nutritive blood-vessels and correspond exactly in their course and branchings to the latter. The intercellular substance consists of lamellse, which are arranged concentrically round the canals. The Haversian canals begin on the surface of the bone
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 ORGANIZATION AND DEVELOPMENT OF ANIMALS IN GENERAL. 41 pact intercellular substance, which is also traversed by numerous canals, known as Haversian canals. These contain the nutritive blood-vessels and correspond exactly in their course and branchings to the latter. The intercellular substance consists of lamellse, which are arranged concentrically round the canals. The Haversian canals begin on the surface of the bone, which is covered by a vascular and nervous connective tissue layer, known as periosteum, and open into larger spaces (marrow spaces), which in the long bones occupy the axis of the bone, but in the FIG. 31a.—Longitudinal section through a spongy bones have an irregular long bone (after KSlliker). e, Haver- OJ sian canal, distribution. In a seoond form of osseous tissue the cells themselves remain in the outer part of the excreted intercellular substance, and only their
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