A CONTRIBUTION TO THE FUNCTIONAL MEANING OF THE SUBSTITUTION OF PRIMARY BY SECONDARY BONE TISSUE

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Abstract
In ossified tendons of birds, by progressive resorption and deposition, the primary bone, containing long and thick collagenous fiber bundles, is replaced by secondary bone, composed of Haversian systems connected by an amorphous afibrillar substance, less resistant to traction than primary bone. Gebhardt''s hypothesis, that bone tissue structures are produced in response to mechanical stimuli and provide mechanical resistance, does not fully explain the phenomena in ossified tendons, or, indeed, in the whole skeleton. The author''s previous suggestion seems to be more satisfactory[long dash]that the structural rearrangement of bone matrix or of any calcified tissue depends largely on the continuous need for mobilization of mineral salts, which are only temporarily stored in bone and other calcified structures.

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