In the membranous skeleton ______ sheath surrounds the central nervous system.

In the membranous skeleton ______ sheath surrounds the central nervous system.

جھلی نما کنکال میں ______ میان مرکزی اعصابی نظام کو گھیرے ہوئے ہے۔
Explanation

In the membranous skeleton, the perineurium sheath surrounds the central nervous system. 

The perineurium is a protective layer of connective tissue that encases nerve fibers.

It providing support and shielding them from external damage.