神经外膜

例句：

1. 1.The nerves in the brain are surroundedby a thin layer of tissue called themeninges.
   大脑中的神经被一层叫做脑膜的薄组织包围。
2. 2. Thecerebellum is covered bya thin layer of connective tissue knownas the pia mater.
   小脑被一层叫做蛛网膜的结缔组织覆盖。
3. 3. The meninges playa crucial role in protecting the brain andspinal cord from injury.
   脑膜在保护大脑和脊髓免受损伤方面起着至关重要的作用。