Section of the Knee
This illustration shows a section on the knee (A, Femur; B, Tibia; C, Patella; D, Synovial sac; E, bursæ). The knee is a hinge-joint, and the bones entering into its formation are the lower end of the femur, the upper end of the tibia, and the posterior surface of the patella (knee-cap).
John H. Finley ed. Nelson's Perpetual Loose-Leaf Encyclopaedia (vol. 7) (New York, NY: Thomas Nelson and Sons, 1917) 132