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, 7-10 of 10; PICTURE 7-This network of spongy bone is known as the primary spongiosa. PICTURE 2-As the connective tissue between trabeculae differentiates into the hematopoietic tissue of bone marrow, these regions of the primary spongiosa become true