1. OSSEOUS TISSUE ORGANIZATION
11/13/14
OSSEOUS TISSUE ORGANIZATION

2. 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

3. 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

4. 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

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

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

7. 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

8. 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)