bone histo Flashcards
What is Bone Tissue?
💡 Bone = Osteo
📌 A calcified connective tissue with calcium and phosphate salts.
What are the Two Bone Coverings?
📌 Periosteum (outer) & Endosteum (inner).
What are the Two Layers of the Periosteum?
📌 Outer fibrous layer → Collagen, fibroblasts, blood vessels.
📌 Inner cellular layer → Osteogenic cells, osteoblasts.
What are the Four Bone Cells?
📌 Osteogenic cells → Stem cells.
📌 Osteoblasts → Bone-forming cells.
📌 Osteocytes → Mature bone-maintaining cells.
📌 Osteoclasts → Bone-resorbing (eating) cells.
What is the Function of Osteogenic Cells?
📌 Bone stem cells that divide & form osteoblasts.
What is the Function of Osteoblasts?
📌 Produce bone matrix (osteoid) & initiate calcification.
What is the Function of Osteocytes?
Maintain bone matrix & exchange nutrients via canaliculi.
What is the Function of Osteoclasts?
📌 Break down bone using enzymes & acid (bone resorption).
What Type of Collagen is in Bone?
📌 Type I Collagen (acidophilic matrix).
What are the Two Types of Bone Growth?
📌 Appositional growth → Increases width by osteoblast activity .
📌 Interstitial growth → ❌ Does NOT occur in bone.
What is the Function of the Endosteum?
📌 Bone growth & repair (contains osteogenic cells & osteoblasts).
What is an Osteoid?
📌 Uncalcified, immature bone matrix.
What is Howship’s Lacuna?
📌 Bone erosion pit where osteoclasts break down bone.
How Do Osteocytes Communicate?
📌 Via gap junctions in canaliculi.
What is the Main Function of Bone Tissue?
📌 Support, protection, movement, mineral storage, blood cell production
What is Found in the Haversian Canal?
📌 Blood vessels & nerves.
What Connects Haversian Canals?
📌 Volkmann’s Canals.
