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Bone Histology
6.5--Histology of Bone Tissue
| Term | Definition |
|---|---|
| CALCIFICATION | FORMATION AND DEPOSITION OF MINERAL SALTS IN THE ECM OF BONE TISSUE ESTABLISHED BY COLLAGEN FIBERS. HARDENS BONE TISSUE |
| OSTEOGENIC CELLS | UNSPECIALIZED STEM CELLS; FORM OSTEOBLASTS. FOUND IN PERIOSTEUM, ENDOSTEUM, AND BLOOD VESSEL CANALS |
| OSTEOBLASTS | BONE-BUILDING; SECRETE COLLAGEN INTO ECM AND INITIATE CALCIFICATION. BECOME OSTEOCYTES AFTER SELF-TRAPPING IN SECRETIOSN |
| OSTEOCYTES | MAINTAIN BONE TISSUE; EXCHANGE OF NUTRIENTS, WASTE, ETC. |
| OSTEOCLASTS | IN ENDOSTEUM; RUFFLED BORDER FACES BONE SURFACE TO RELEASE LYSOSOMAL ENZYMES FOR BONE ECM BREAKDOWN |
| RESORPTION | BREAKDOWN OF BONE ECM; NORMAL PART OF GROWTH DEVELOPMENT, AND REPAIR |
| OSTEON | HAVERSIAN SYSTEMS. CONTAINS CENTRAL (HAVERSIAN) CANAL SURROUNDED BY CONCENTRIC LAMELLAE; RUN PARALLEL TO DIAPHYSIS AND THICKEST IN PARTS OF LEAST DIRECTION |
| CONCENTRIC LAMELLAE | RINGS INCREASING IN DIAMETER AROUND THE CENTRAL HAVERSIAN CANAL IN BONE TISSUE FOR BLOOD FLOW |
| LACUNA | SMALL SPACES BETWEEN LAMELLAE WHICH HOLD THE OSTEOCYTES. CANALICULI RADIATE FROM LACUNA |
| CANALICULI | EXTENSIONS OF OSTEOCYTES ALLOWING FOR CONNECTIONS BETWEEN OSTEOCYTES AND COMMUNICATION VIA GAP JUNCTIONS |
| INTERSTITIAL LAMELLAE | CONTAIN LACUNAE WITH OSTEOCYTES AND CANALICULI. FRAGMENTS OF OLD OSTEONS |
| PERFORATING CANALS | RUN PERPENDICULAR TO CENTRAL CANALS; VESSELS CONNECT WITH THOSE OF CENTRAL CANALS. |
| CIRCUMFRENTIAL LAMELLAE | ARROUND INNER AND OUTER CIRCUMFRENCE OF SHAT; DEEP OF PERIOSTEUM ARE OUTER; THOSE THAT LINE MEDULLARY CAVITY ARE INNER CIRCUMFERENTIAL |
| SPONGY BONE | LESS DENSE; MORE SPACE. INNER CIRCLE; INNER CIRCUMFRENTIAL LAMELLAE. CONTAIN SPACES FOR RED BONE MARROW AND AREA FOR BONE GROWTH VIA OSTEOBLAST LINING ON LAMELLAE |
| TRABECULAE | PATTERN OF SPONGY BONE TISSUE IN THIN COLUMNS |
| INTRAMEMBRANOUS OSSIFICATION | STEM CELLS-->BONE |
| ENDOCHONDRAL OSSIFICATION | STEM CELLS-->CARTILAGE-->BONE |