Gerald has experienced increasing difficulties with muscle weakness, motor coordination, and body balance, which physicians have attributed to multiple sclerosis. these symptoms are most likely to be directly linked with the degeneration of

Answer is: the myelin sheath.

The myelin sheath is a extended and modified plasma membrane wrapped around the nerve axon in a spiral fashion. Myelin is a fatty white substance that surrounds the axon of some nerve cells, forming an electrically insulating layer.

Demyelination is the loss of the myelin sheath and result in many deseases.