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: JOINT: Pathogenesis of Rheumatoid Arthritis, Graphic View-NORMAL; Arrow on Synovial Fluid -- The normal joint is composed of tissues that provide structural support and minimize friction. The principle articular structures are surrounded by a fibrous capsule. Within the capsule, the bony surfaces are ca