Relating to the ependyma, which is a thin layer of cells that lines the fluid-filled spaces inside the brain and spinal cord.
From Greek 'ependyma' meaning 'upper garment' or 'covering,' referring to the membrane that covers or lines these internal spaces. The term was adopted in medical terminology in the 19th century to describe this brain tissue lining.
Your brain and spinal cord contain a special liquid called cerebrospinal fluid, and it's kept contained by this ependymal layer—essentially your brain has a waterproof lining made of these specialized cells!
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