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About the time of birth in mammals, a secondary ossification center appears in each end (epiphysis) of long bones. Periosteal buds carry mesenchyme and blood vessels in and the process is similar to that occurring in a primary ossification center.
Osseous Development. Of the four portions of the temporal bone the petrous part and styloid process undergo endochondral ossification whereas the squamous and tympanic part develop through intramembranous ossification. Spread evenly over the entire bone are eight ossification centers that create three of the main fontanelles before birth.