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The present work discusses the ontogenetic basis of these characters in terms of the ontogeny of the structure and textural bone compactness (TBC) of the humeral diaphysis in a growth series of common dolphins (<jats:italic>Delphinus delphis<\/jats:italic>). The texture of the primary periosteal deposits is compact; soon after their accretion, the deposits undergo an extensive erosion that turns them into a cancellous tissue. A diffuse endosteal front of resorption expands in parallel with the growth of the cortex and acts as small units scattered within the cortices. Starting soon after birth and continuing throughout the life of the animals, the compactness of the periosteal cortex decreases at both general and local levels. This trend correlates strongly with the increase in size of the diaphyseal section and reflects the fact that relatively more bone is eroded than deposited during growth in the cancellous parts of the cortex. In the broad sense, this is basically an osteoporotic process, which is not identical, however, to senile or disuse osteoporoses.<\/jats:p>","DOI":"10.1002\/jmor.1051980203","type":"journal-article","created":{"date-parts":[[2005,2,24]],"date-time":"2005-02-24T16:34:33Z","timestamp":1109262873000},"page":"149-164","source":"Crossref","is-referenced-by-count":58,"title":["On how the periosteal bone of the delphinid humerus becomes cancellous: Ontogeny of a histological specialization"],"prefix":"10.1002","volume":"198","author":[{"given":"Vivian","family":"De Buffrenil","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Damien","family":"Schoevaert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,2,6]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"315","article-title":"La structure du tissu osseux envisag\u00e9e comme l'expression de diff\u00e9rences dans la vitesse de l'accroissement","volume":"58","author":"Amprino R.","year":"1947","journal-title":"Arch. 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