. Elements of histology. Histology. Chap. VII.] Bone. 61 74. Intermembranons formation.—All bones not preformed in the embryo as cartilage are developed directly from the periosteum in the manner of the periosteal bone just described (Fig. 37). Here also. Fig. 37.—A small mass of Bone Substance in the Periosteum of the Lower Jaw of a Human Foetus. a, Osteogenetic layer of periosteum ; 6, multinucleated giant cells, myeloplaxes. The one in the middle of the upper margin corresponds to an osteoclast, whereas the smaller one at the left upper corner appears concerned in the formation of hone. Abo
. Elements of histology. Histology. Chap. VII.] Bone. 61 74. Intermembranons formation.—All bones not preformed in the embryo as cartilage are developed directly from the periosteum in the manner of the periosteal bone just described (Fig. 37). Here also. Fig. 37.—A small mass of Bone Substance in the Periosteum of the Lower Jaw of a Human Foetus. a, Osteogenetic layer of periosteum ; 6, multinucleated giant cells, myeloplaxes. The one in the middle of the upper margin corresponds to an osteoclast, whereas the smaller one at the left upper corner appears concerned in the formation of hone. Above c the osteoblast cells become surrounded by osseous substance and thus become converted into bone-cells. (Atlas.) the new bone is at first spongy bone, which in its inner layers gradually becomes converted into compact bone. In all instances during embryo life and after birth the growth of a bone in thickness takes place after the manner of 'periosteal hone; this is at first spongy, but is gradually converted into compact bone. 75. All osseous substance is formed in the embryo and after birth by the osteoblast or marrow cells (Gegenbaur, Waldeyer) : each osteoblast giving origin to a zone of osseous matrix, and in the centre of this. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Klein, E. (Edward), 1844-1925. Philadelphia : H. C. Lea's Son
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