myelin sheath

myelin-sheath的词性：
n.（名词）

1. The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and facilitates the transmission of nerve impulses. In the peripheral nervous system, the sheath is formed from the cell membrane of the Schwann cell and, in the central nervous system, from oligodendrocytes.Also called medullary sheath
髓鞘：髓磷脂的隔离封套，它包围在神经纤维或轴突，而且使神经冲动的传输变得顺畅。在末梢神经系统中，鞘由施万细胞的细胞膜形成，而在中央神经系统中，由少突神经胶质细胞形成也作 medullary sheath