why our upper jaw is immovable
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We can move only the lower jaw because the upper jaw is connected with the skull by an immovable joint while the lower jaw is connected by a movable joint which makes the movement possible.
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Immovable joints (called synarthroses) include skull sutures, the articulations between the teeth and the mandible, and the joint found between the first pair of ribs and the sternum. ... Joints allowing full movement (called diarthroses) include many bone articulations in the upper and lower limbs.
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