A major new find from Swartkrans, the first articulating hipbone, thigh bone, and shin bone of Paranthropus robustus, changes ...

Four important synovial joints used in most sporting actions are the elbow and shoulder joints in the arm, and the knee and hip joints in the leg. The elbow and knee joints are both hinge joints.

ii. With loss of bones, switch to bones articulating hinge between upper and lower jaw. Amphibian, reptile: quadrate (upper) and articular (lower) jaw form hinge. 2 small bones form hinge: not very ...