4. Answer the following:
a) What is a ball and socket joint? The ball
fb) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
Answers
Answer:
a) Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint.
b) There is only one movable joint in the skull. That is the joint connecting the lower jaw, or mandible, to the rest of the skull.
(c) Our elbow cannot move backwards because it has a hinge joint which allows the movement in one plane only.
Answer:
A) ball and socket joints are also called spheroidal joint in vertebrae anatomy ,a joint in which the round surface of bone removed with in the depression and another bone allow greater freedom to move than any one of kind join
B) the mandible is the only removable bone of skull it fuse together during the first year from the single u shaped mandible of adult skull
C) Our elbow cannot move backward because it has a hinge joint which allow the movement in one plane only