The process in which the wraps of cell membrane that constitute myelin are laid down around an axon by Schwann cells in the peripheral nervous system. [GOC:dgh]
The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins. [ISBN:0716731363]
An axon part that is located adjacent to the nodes of Ranvier and surrounded by lateral loop portions of myelin sheath. [GOC:mah, GOC:mh, NIF_Subcellular:sao936144858]
Regions within compact myelin in which the cytoplasmic faces of the enveloping myelin sheath are not tightly juxtaposed, and include cytoplasm from the cell responsible for making the myelin. Schmidt-Lanterman incisures occur in the compact myelin internode, while lateral loops are analogous structures found in the paranodal region adjacent to the nodes of Ranvier. [GOC:dgh]