Question

Which of the skull bones are movable?
Why can our elbow not move backwards?​

Answer 1

Answer:

Solution:

(a) Ball and socket joint is a movable joint. In this, a bone with a round head fits into the hollow space of another bone. This makes the bone to rotate freely. For example, bones of the hip and shoulder can move in all directions due to ball and socket joints.

(b) Lower jaw bone (Mandible bone) is the only skull bone that is movable.

(c) Our elbow cannot move back because it has a hinge joint which allows the movement in one plane only.