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: Intramembranous ossification bone growth series, 1-6 of 10; PICTURE 1-Osteoblasts form a cluster at a site in the fibrous membrane called a center of ossification. PICTURE 2-There, the osteoblasts secrete intercellular substances that are partly composed of collagenous fibers that form a matrix. P