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An 18-year-old male was brought to the emergency department after he was…

- - - - Uricle & Saccule
        
        Each sac has on its inner surface a single patch of sensory cells called a macula, which monitors the position of the head relative to the vertical.
        
        Semicircular Canals
        
        Lateral
        
        Its ampulla is continuous with the utricle and the other end opens below the common limb.
        
        This canal is sensitive to movements within a transverse plane.
        
        Superior
        
        extends across the petrous part of the temporal bone under the arcuate eminence
        
        It has an ampulla on its base that is continuous with the utricle. Its other end joins with the posterior semicircular canal at the common limb.
        
        The canal contains fluid that is sensitive to movement or rotation of the head within a lateral plane.
        
        Posterior
        
        Part of the temporal bone.
        
        It has an ampulla that opens in the lower part of the vestibule and the other end is continuous with the common limb.
        
        This canal is sensitive to movements or rotation of the head within an anterior-posterior plane.
        
        interconnected bony tube-like structures located posteriorly and superiorly to the vestibule of the ear
- - - - are simple “cracks” in the skull.
        
        Most require no treatment. The concern with these fractures is that a force large enough to break the skull may have damaged the underlying brain or blood vessels.
      - Depressed skull fractures
        
        in which part of the bone presses on or into the brain.
        
        The extent of the damage depends on what part of the brain the depressed skull overlies, as well as the nature of any associated injuries to other tissues.
        
        Compound fractures
        
        the trauma is severe enough to break the skin, bone
        
        these fractures are usually associated with severe injuries to the brain, blood vessels, and nerves, and repairing these structures may also be necessary.
        
        These fractures therefore bring the possibility of infection from environmental debris.