PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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DIAGRAM: BONE: Endochondral ossification bone growth series, 13-14 of 14; PICTURE 13-As growth in length occurs, bone diameter also increases. This occurs as the bone lining the marrow cavity is resorbed while osteoblasts from the periosteum add new osseous tissue around the outer surface of bone. PICTURE 14-In