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Skeletal System pt. 2

Skeletal System pt. 2. Microscopic Structure of Bones Bone Development. Agenda. Do Now Introduce: Microscopic Structure of Bone Bone Matrix Diagram Introduce: Bone Growth and Development Assign: Chapter Project Homework Question Exit Ticket. Microscopic Structure.

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Skeletal System pt. 2

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  1. Skeletal System pt. 2 Microscopic Structure of Bones Bone Development

  2. Agenda • Do Now • Introduce: Microscopic Structure of Bone • Bone Matrix Diagram • Introduce: Bone Growth and Development • Assign: Chapter Project • Homework Question • Exit Ticket

  3. Microscopic Structure • Osteocytes (osteo-: bone, -cyte: cell) are located in small cavities in the matrix called lacunae. • The extracellular (extra-: outside) matrix in bone tissue is hard material composed of collagen and inorganic salts • Bones also contain nerves (ouch!) and blood vessels.

  4. Microscopic Structure • Lacunae are connected by canaliculi(singular: canaliculus). This is how the cells share nutrients and communicate. • Where do the blood vessels and nerves come in? • Lacunae are arranged in concentric (co:- same, -centric: center) circles around osteonic canals. • The group of rings that share the same osteonic canal are called an osteon • The vertical osteoniccanals are connected transversely by communicating canals.

  5. Whiteboard Practice

  6. Multiple Choice A: Osteon B: Osteonic Canal C: Periosteum D: Spongy Bone ?

  7. Multiple Choice A: Lacuna B: Osteonic Canal C: Periosteum D: Spongy Bone ?

  8. Multiple Choice A: Osteon B: Osteonic Canal C: Periosteum D: Spongy Bone ?

  9. Multiple Choice A: Osteon B: Osteonic Canal C: Periosteum D: Spongy Bone ?

  10. Multiple Choice • Identify the Lacunae A B

  11. Multiple Choice • Identify the Canaliculi A B

  12. Bone Development and Growth Intramembranous Bones: Flat Bones • Develop from sheet-like masses of connective tissue that form where future bones will be located

  13. Intramembranous Bone

  14. Endochondral Bone • Long Bones • Develop from masses of hyaline cartilage shaped like bones.

  15. Long Bone Growth • In the developing body, the epiphysealdisk separates the diaphysicossification center and the epiphysic ossification center. • The epiphyseal disk is a layer of cartilage that allows bones to continue to grow in length. • When the growth centers meet and the cartilage disappears, the bone can no longer grow in length.

  16. Chapter Project

  17. Homework Questions • How can the epiphysial disk sustain damage? • What happens if this disk is damaged? Write your answers into your notes. Come to class tomorrow prepared to discuss.

  18. Exit Ticket A • Epiphyseal Disk • Epiphysic Ossification Center • Diaphysic Ossification Center B C D

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