6/5/2023 0 Comments Freely movable joints![]() ![]() This is the cause of osteoarthritis, which can be both painful and debilitating. ![]() Eventually, all of the cartilage may wear away. If the cartilage that cushions bones at joints wears away, it does not grow back. Of all the parts of the skeletal system, the joints are generally the most fragile and subject to damage. The hip and shoulder are the only two ball-and-socket joints in the human body. It allows forward and backward as well as upward and downward motions. A ball-and-socket joint allows the greatest range of movement of any movable joint.The joint between the radius in the lower arm and carpal bones of the wrist is a condyloid joint as is the joint at the base of the index finger. A condyloid joint is one in which an oval-shaped head on one bone moves in an elliptical cavity in another bone, allowing movement in all directions except rotation around an axis.In the wrist, this type of joint allows the hand to bend upward at the wrist and also to wave from side to side while the lower arm is held steady. The joints between the tarsals in the ankles and between the carpals in the wrists are mainly gliding joints. A plane joint also called a gliding joint, allows two bones that glide over one another.This joint allows the thumb to move toward and away from the index finger and also to cross over the palm toward the little finger. An example of a saddle joint is the joint between the first metacarpal bone in the hand and one of the carpal bones in the wrist. ![]()
0 Comments
Leave a Reply. |