Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
bone formation methods
|
intramembranous ossification - bone forms directly from embryonic membranes
endochondral bone formation - bone forms indirectly from cartilaginous templates |
|
intramembranous ossification steps
|
used for non weight bearing bones
1. embryonic mesenchymal cells condense into a connective tissue "membrane" with increased vascularization 2. osteoblasts differentiate from the mesenchymal cells |
|
intramembranous ossification steps
|
3. calcium phosphate salts become incorporated (blasts become cytes)
4. spicules develop forming bony meshwork. spaces filled with bone marrow cells and blood vessels 5. spongy bone core of flat bone retains its trabecular appearance and remodelling is continual by clasts and blasts |
|
Endochondral ossification
|
forms most of the bones in the body. forms long bones. forms from cartilage model
|
|
Steps of endochondral ossification
|
1. hyaline cartilage forms template
2. calcification tears down cartilagenous tissue 3. mineralization (pg 117 on 13) 4. invasion of blood vessels. chondrocytes die, osteogenic invade 5. |