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<big><center>[[Developmental Biology - Anatomy & Physiology|'''BACK TO DEVELOPMENTAL BIOLOGY]]</center></big>
 
<big><center>[[Developmental Biology - Anatomy & Physiology|'''BACK TO DEVELOPMENTAL BIOLOGY]]</center></big>
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==Introduction==
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Osteogenesis is the formation of bone. Bone forms from one of three lineages; the skull forms from neural cest; the limb skeleton forms from lateral plate mesoderm; and the axial skeleton forms from paraxial mesoderm (sclerotome). There are two methods of osteogenesis. Both involve the transformation of pre - existing mesenchymal tissue into bone.
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#'''Intramembranous Ossification''' - direct conversion of mesenchymal tissue into bone. Occurs in production of the skull.
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#'''Endochondrial Ossification''' - mesechymal tissue first differentiates into cartilage, then into bone. This occurs in the production of limb and axial skeleton.
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#*Limb cartilage is produced in a proximal to distal direction as a continuous structure. It becomes punctuated with joints later, and then converted to bone.
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