1. Healing and Gangrene

2. Gangrene:
It’s a necrosis with putrefaction, massive necrosis “ large tissue or whole organ.
It has 3 types:
1- Dry or senile.
2- Moist.
3- Infective or Gas gangrene.

3. 1- Dry gangrene “Gross”:

4. Healing: Replacement of damaged tissue by new, healthy, living tissue.
Either by:
1- Regeneration mechanism or
2- Scaring “fibrosis”, Organization.
Regeneration is the replacement of tissue by same type of cells.
Organization is the replacement of tissue by Granulation tissue.

5. 2- Granulation tissue:

6. 3- Granulation tissue:

7. 4- Primary union:

8. 5- Secondary union:

9. 6- Myocardial scaring:

10. 7- Repair after myocardial infarction: