The precailagenous analog to bone arises from?

There are two major modes of bone formation, or osteogenesis, and both involve the transformation of a preexisting mesenchymal tissue into bone tissue. The direct conversion of mesenchymal tissue into bone is called intramembranous ossification. This process occurs primarily in the bones of the skull. In other cases, the mesenchymal cells differentiate into cailage, and this cailage is later replaced by bone. The process by which a cailage intermediate is formed and replaced by bone cells is called endochondral ossification Ref:Inderber singh Embryology.