Respuesta :
the myelin sheath is the fatty substance that insulates and protects the axon
Answer:
D. Myelin Sheath
Explanation:
The Myelin sheath is made of fatty tissue that wraps itself around the axon of the nerves so as to provide protection, insulation and better transmission to the electrical signals across it. The fact that it comprises of fatty substances gives it the properties it needs to provide these functions.