. Chordate anatomy. Chordata; Anatomy, Comparative. HISTOLOGY 105 bones, notably the long bones of the appendages, have internal cavities (Fig. 100) occupied by a more or less vascular soft tissue, the marrow. The "yellow marrow" of long bones contains much fat. "Red marrow" is highly vascular, contains little fat and may be a source of blood cells of various types. In long bones the larger blood-vessels lie approximatel}- parallel to the long axis of the bone. Around such vessels the bone lamellae are arranged in concentric order (Figs. loi and 102) forming so-called Haver
. Chordate anatomy. Chordata; Anatomy, Comparative. HISTOLOGY 105 bones, notably the long bones of the appendages, have internal cavities (Fig. 100) occupied by a more or less vascular soft tissue, the marrow. The "yellow marrow" of long bones contains much fat. "Red marrow" is highly vascular, contains little fat and may be a source of blood cells of various types. In long bones the larger blood-vessels lie approximatel}- parallel to the long axis of the bone. Around such vessels the bone lamellae are arranged in concentric order (Figs. loi and 102) forming so-called Haver-. FiG. 102.—Section, highly magnified, of compact bone from the shaft of the human humerus. The section, cut transversely to the long axis of the bone, shows four Haversian systems with their central canals, concentric lamellae of bone, lacunae between adjacent lamellae, and canaliculi extending between lacunae. (From Bremer, "Text-book of Histology"; after Sharpey.) sian systems. These concentric systems are much less prominently developed in fiat bones. The matrix of bone consists of commingled organic and inorganic materials. Collagenous and other protein substances constitute the organic part while various salts of calcium, mostly the phosphate and carbonate, are the most important inorganic ingredients. Bone, because of the rigidity of its calcified matrix, is incapable of such interstitial growth as occurs in cartilage. A further difference between cartilage and bone lies in the fact that the cartilage cell produces matrix in all directions and thus surrounds itself by its own product, whereas the osteoblast produces matrix only at such part of its surface as is adjacent to the already- formed bone. A layer of bone cells building up lamella upon lamella. 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 ori
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
