they are made of schwann cells
The knife had a sheathe included.
a sword
sheathe
In a store that sells knives
Sheathe.
It is called as myelin sheath. It acts as an insulator of the electrical wire. It is made up of cells.
Myelin insulation insulates nerve fibers by wrapping around them and forming a protective sheath. This myelin sheath helps to increase the speed of nerve impulse conduction along the nerve fibers.
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breathe wreathe sheathe
because it is frightened or scared
A myelin sheath is a layer of myelin (a dielectric, or electric insulator) around the axon of a neuron.
myelin sheath