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Bone & Cartilage Development - Anatomy & Physiology (view source)
Revision as of 10:16, 31 August 2008
, 10:16, 31 August 2008no edit summary
#Blood vessels invade the central region of the diaphysis to transport bone marrow stem cells and osteoclasts.
#Blood vessels invade the central region of the diaphysis to transport bone marrow stem cells and osteoclasts.
#*The osteoclasts break down the cartilage matrix to allow room for the bone marrow.
#*The osteoclasts break down the cartilage matrix to allow room for the bone marrow.
#There is no perichondrium surrounding the eiphysis.
#*This allows for expansion in length of the bone, but means that there are no surrounding oasteoblasts to invade.
#*To achieve osteogenesis, blood vessels invade from the diaphysis and carry osteoblasts with them.
#*''In the epiphysis, osteoblasts initiate bone growth from the inside - out. This is called secondary ossification.''
#*In some mammals, secondary ossification occurs after birth.
#The bone becomes covered in a layer containing osteoblasts.
*Cartilage is ''not replaced by bone'' in two areas:
:In between the diaphysis and epiphysis, a region called the '''epiphyseal growth plate (EPG)'''.
:At the ends of the epiphysis, between the joints. Acts as a '''shock absorber'''.
==Bone Growth==