Best Answer: Core: white hot Mantle: red hot to white hot depending on depth (molten lava...) Crust: various shades depending on local composition
An example of a simple synovial joint, e.g. a metacarpophalangeal (finger) joint, is shown above-right. More complicated synovial joints may involve more than two bones, may include sesamoid bones e.g. the patella in the knee joint, may include bursae, and may include accessory ligaments.
Synovial Joints of the Skeletal System. Based on the type of movement the joint allows and its structure, synovial joints can be put into several categories. 1  gliding (plane) joint: have flat or slightly curved articular surfaces and allow gliding movements.