Origin: NL, fr. Gr. Round the bones; around _ a bone: cf. L. Periosteon.
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Yes, it is. Inside, endosteum or internal periosteum is 'eaten' by osteoclast to enlarge the bone cavity. Meanwhile, deposistion happens outside to make a tought bone wall. http://academic.evergreen.edu/curricular/anatomyphysiology/ossification/img013.GIF ...
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