Bone (osseous tissue)
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Bone or osseous tissue consists of cells, collagenous fibres, and an intercellular matrix of organic substances.
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The organic matrix is chiefly made up of osseo mucoid and in this matrix, collagen fibres are embedded and the fibrils form a major portion of the intercellular substance.
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The inorganic matter is composed of calcium phosphate, calcium carbonate and small amount of other minerals. The minerals are present in the form of crystals of hydroxyaptite embedded in the matrix and are arranged in a regular manner in relation to the collagen fibres.
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The bone cells or osteocytes are irregularly oval cells with fine cytoplasmic processes, a large oval nucleus and faintly basophilic cytoplasm. These cells occupy spaces called lacunae in the solid intercellular substance and numerous canaliculi radiate from the lacunae and are occupied by the cytoplasmic processes of osteocytes.
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The intercellular substances of bone are in the form of thin plates or lamellae between or within which are the lacunae and canaliculi occupied by osteocytes and their processes. The arrangement of these lamellae is different in compact and cancellated bones.
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Organisation of bone tissue:
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Last modified: Friday, 20 August 2010, 11:35 AM