Assertion: nervous system's cell | /r/CapableOf | form the myelin sheath
Facets:
value: in the pns
type: LOCATION
value: by wrapping themselves
type: MANNER
Source sentences:
text: Special cells form the myelin sheath by wrapping themselves around the axons of neurons.
text: In the CNS, the cells forming the myelin sheath are called oligodendrocytes.
text: In the PNS, special cells known as Schwann cells form the myelin sheath.