OSSEOUS TISSUE ORGANIZATION

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Presentation transcript:

OSSEOUS TISSUE ORGANIZATION 11/13/14 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 (plate-like membrane) 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

Compact bone layers reminder: Periosteum Outside covering of all bones except parts enclosed in joint capsules Peri = around (ex: perimeter)

Endosteum Lines the marrow cavity and lines the central canals - Endo = inside (ex: endoskeleton)

Organization of 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

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)