Healthy human skull. Side view X-ray showing the skull and the outline of the head (black). The bones of the cranium are fused together to form a complete structure that protects the brain. Attached at the temporomandibular joint (TMJ) is the mandible, or jaw, (at lower right) which allows actions such as chewing and speech to be performed. Fillings in the teeth can also be seen. The skull is supported by the vertebrae of the neck (lower left). At the front of the skull the sinuses can be seen (dark), numerous air spaces lined with mucous membranes.
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