Is their a joint in the skull?

Yes, there is a joint in the skull. It is called the temporomandibular joint (TMJ) and it connects the lower jaw (mandible) to the temporal bone of the skull. The TMJ is a synovial joint, which means that it is a freely movable joint that is lined with a synovial membrane. The synovial membrane produces a fluid that lubricates the joint and helps to reduce friction. The TMJ allows the lower jaw to move up and down, side to side, and forward and back. This movement is essential for chewing, talking, and yawning.