Lecture 2-3.5 Intramembranous and Endochondrial ossification

Card Set Information

Author:
studysuccess
ID:
311202
Filename:
Lecture 2-3.5 Intramembranous and Endochondrial ossification
Updated:
2015-11-13 23:57:48
Tags:
Lecture Intramembranous Endochondrial ossification
Folders:
Lecture 2-3.5 Intramembranous and Endochondrial ossification
Description:
Lecture 2-3.5 Intramembranous and Endochondrial ossification
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user studysuccess on FreezingBlue Flashcards. What would you like to do?


  1. describe pointing to an osteocyte in intramembranous ossification
    little cells in the center w/canaliculi branches coming off.
  2. list 4 steps in Intramembranous ossification
    • 1) mesenchyme> osteoblasts>
    • 2) osteoblasts> osteocytes.
    • 3) mesenchyme> periosteum forms
    • 4) osteoblasts> compact bone.
  3. define Trabeculae
    group of partitions formed by bands or columns of connective tissue
  4. step 1 in intramembranous ossificaton
    *occurs on or in fibrous connective tissue

    -mesenchyme cells cluster into soft tissue along blood vessels.

    -become osteoblasts,

    -and secrete osteoid tissue away from vessles.
  5. step 2 of intramembranous ossificaton
    -When osteoid tissue is mineralized by calcium salts to harden the matrix,

    -osteoblasts become trapped in own matrix, and become osteocytes.
  6. step 3 of intramembranous ossificaton
    -Meanwhile, mesenchyme adjacent to developing bone condenses and forms fibrous periosteum,

    -spongy bone becomes honeycomb of calcified trabeculae.
  7. step 4 intramembranous ossificaton
    -osteoclasts absorb some trabeculae making medullary cavities,

    -osteoblasts beneath the periosteum fill spaces between trabeculae to form compact bone.
  8. where does ossification occur
    the ossification center/lacunea.
  9. name of canal that is diagonal passage in bone
    perforating (Volkmann) canal.
  10. explain lamellae
    onionlike concentric layers of lacunae connected by canaliculi.
  11. explain a haversian canal
    a central canal in which lamelae are surrounding.
  12. define chondrycytes
    cell that has secreted the matrix of cartilage and become embedded in it.
  13. List the 4 stages in endochondrial ossification
    • 1) mesenchyme>osteoblasts
    • 2) osteoblasts>osteocytes
    • 3) mesenchyme to periosteum
    • 4) periosteum to compact bone
  14. first stage in Endochondrial ossification
    -mesenchume condenses into hyaline cartilage w/fibrous perichondrium

    -pericondrium produces condrocytes and cartilage model grows
  15. second stage in Endochondrial ossification
    -Pericondrium becomes periosteum when it stops producing chondrocytes and starts producing osteoblasts.

    -Osteocytes deposite around the middle, and chondrocytes inflate and die forming calcified walls
  16. third stage in Endochondrial ossification
    - Blood vessels penetrate ossification center. 

    -Osteoclasts dissolve calcified tissue to form primary cavity in diaphysis.

    -Chondrocytes in the epiphysis enlarge and die creating a secondary ossification center, with one epiphysis lagging behind the other.
  17. fourth stage in Endochondrial ossification
    -Epiphysis fills w/spongy bone throughout childhood. Epiphyseal plate continues to grow until gap closes around late teenage years.
  18. what is articulation
    the degree of movement
  19. define osteoporosis, cause & treatment.
    • def: brittle bones
    • cause: bone reabsorption outweighs deposit
    • treatment: exercise & good bone building diet between 20-40.
  20. name 3 degrees of motion & describe them
    • 1) synarthrosis: immovable
    • 2) amphiarthrosis: slightly movable
    • 3) diarthrosis: freely movable

What would you like to do?

Home > Flashcards > Print Preview