Answer:
An axis is a straight line around which an object rotates. Movement at the joint takes place in a plane about an axis. There are axis of rotation.
(i) Sagital Axis: It passes horizontally posterior to anterior and is formed by the intersection of the sagital and transverse planes.
(ii) Frontal Axis: It passes horizontally from left to right and is formed by the intersection of the frontal and transverse planes.
(iii) Vertical Axis: It passes vertically from inferior to superior and is formed by the intersection of the sagital and frontal planes.
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