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*'''Cells'''
 
*'''Cells'''
**Osteoblasts, osteocytes, chondroblasts and chondrocytes are derived from stromal fibroblastic system; osteoclasts from haematopoietic system
+
**Osteoblasts, osteocytes, chondroblasts and chondrocytes are derived from stromal fibroblastic system ('''osteoprogenitor cells); osteoclasts from haematopoietic system
 +
**Ischaemia and hypoxia favour development of cartilage
 +
**High oxygen tension and good blood supply favour bone development
 
**'''Osteoblasts'''
 
**'''Osteoblasts'''
 
***Mesenchymal cells  
 
***Mesenchymal cells  
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