轴索鞘

例句：

1. 1.The nerve fibers are encased in a thin sheath of connective tissue, known as the nerve sheath.
   神经纤维被一层薄的结缔组织包裹，称为神经鞘。
2. 2.The nerve sheath provides a protective layer for the nerve fibers, preventing them from being damaged by external forces.
   神经鞘为神经纤维提供保护层，防止它们受到外力的损伤。
3. 3. In some cases, the nerve sheath may become inflamed or irritated, leading to pain or discomfort in the affected area.
   在某些情况下，神经鞘可能会发炎或刺激，导致受影响区域的疼痛或不适。