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The subglottis or subglottic region is the lower portion of the larynx, extending from just beneath the vocal cords down to the top of the trachea. The structures in the subglottis are implicated in the regulation of the temperature of the breath.
It is located within the subarachnoid space, an area between two of the three membranes that encase the brain, spinal cord and cauda equina. Cerebrospinal fluid is produced in the brain and along blood vessels found in the subarachnoid space. Because the body produces much more cerebrospinal fluid than it needs each day, most of it is believed to be reabsorbed through sinuses within the brain. Another theory suggests it is reabsorbed through the lymphatic system.