OSSEOUS TISSUE ORGANIZATION

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OSSEOUS TISSUE ORGANIZATION

Bone (Osseous) Tissue Characteristics Dense matrix, supportive connective tissue Majority is solid matrix of calcium phosphate, Ca3(PO4)2 Around collagen fibers (approx. 25% collagen) Osteocytes within lacunae organized around blood vessels

Organization of Compact Bone Tissue Osteon is basic unit of mature compact bone Osteocytes are arranged in concentric lamellae Around a central canal (Haversian canal) containing blood vessels

Perforating Canals Concentric Lamellae Also called horizontal canals or Volkmann’s canals) Perpendicular to the central canal Carry blood vessels into bone and marrow Concentric Lamellae (plate-like membrane) wrapped around the entire long bone Binds osteons together

Spongy Bone Tissue No organized osteons The matrix consists of trabeculae which are strands of bone that make up an irregular “meshwork” / “lattice work” with spaces

Spongy Bone Tissue The space between trabeculae is filled with red bone marrow: Which forms red blood cells and supplies nutrients to osteocytes In some bones, spongy bone holds yellow bone marrow (stores fat)