Swan neck and boutonniere deformities are depicted on the second and third phalanges, respectively.A cross-section of the metacarpophalangeal joint capsules shows progression of the disease, including synovial swelling, erosion, and degeneration. Model Size: 6” x 3-2/5” x 7-4/5”Card Size: 6-1/4” x 8-1/4”Base Size: 6-1/2” x 5”Full size right hand with cutaway views to reveal the effects of rheumatoid arthritis on ligaments, flexor and extensor tendons, muscle, cartilage, bones, synovial membrane, and joint spaces.