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, 7-12 of 14; PICTURE 7-Pluripotent cells from the perivascular tissue differentiate into bone marrow cells and osteoblasts. The osteoblasts migrate to the calcified cartilage matrix where they deposit bone to form primary trabeculae. These consist of