What does "Sheath" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
In the context of medicine, a sheath is a protective covering. It's similar to the idea of a sword being kept in a sheath for protection. In the human body, there are sheaths that cover and protect nerves and other structures. For example, the brain and spinal cord are protected by a sheath made of a tough, flexible material.
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