Talk about ossification of diaphysis of long bones.

From epiphysis to diaphysis : Hyaline growth cartilage (reserve zone) serial cartilage (by axial isogenic groups (proliferation zone) Hypertrophied cartilage (large cells and reduced ground substances Hypertrophic zone) Calcified cartilage (infilterated ground substance with limestone process of cell degeneration (calcification zone) Erosine (cartilage becomes destroyed by vasculo-cojunctive buds Osteogenic zone (bone replaces cartilage.