The radius is the forearm bone of the hand. The ulna is the forearm bone of the elbow. The two bones are not just associated at the elbow and wrist joints, but cross attached by a flexible sheet - like the two posts of a canvas stretcher. ... The motion stops when the
Do arm bones twist over each other?
Unlike the radius, this bone does not twist, so when the hand changes position, the ulna is always in the same position on the inside part of the forearm. Like the radius, the ulna has joints at the elbow and wrist. The joint between the ulna and humerus is a hinge type of joint.
Do your wrist bones cross over?
Ligaments connect the wrist bones to each other and to the hand and forearm bones. Ligaments are like elastic bands that keep bones in place. They cross the wrist from each side to hold the bones together.
