Question

what is pivot joint ? example

Answer 1

the joint that allows movement in up down and sideward movements is called pivot joint.
eg-neck joint between atlas and skull.

Answer 2

pivot joint also called rotary joint or trochoid joint in vertebrate anatomy a freely moveable joint that allows only rotary movement around a single axis. the moving bone rotates within a ring that is formed from a second bone and adjoining ligament.
eg:- the joint of the first and second vertebrae of the neck that allows the head to move back and forth