Don W. Fawcett (2011) CIL:10950, Felis catus, peripheral neuron, myelinating Schwann cell. CIL. Dataset

Schwann cells in peripheral nerves secrete a layer similar to the basal lamina called the lamina externa, boundary layer, or basement membrane. In this micrograph, the lamina externa surrounds the Schwann cells that wrap around both myelinated and unmyelinated axons in a mixed nerve from cat pericardium. Arrows indicate several examples of the outer limit of the basal lamina. Myelinated axons can be distinguished from unmyelinated ones by presence of repeated dark radial rings. Figure 26 from Chapter 1 (The Cell Surface) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the accompanying chapter is available on the ASCB's BioEDUCATE website.

周缘神经中的施万细胞分泌出一种类似于基膜层的结构，称为外层板、边界层或基底膜。在本张显微照片中，外层板环绕着施万细胞，这些细胞在混合神经中包绕着髓鞘化和非髓鞘化的轴突。箭头指示了基膜层外缘的几个实例。通过存在重复的深色径向环，可以区分髓鞘化的轴突与非髓鞘化的轴突。此图源自于Don W. Fawcett M.D.所著《细胞》第二版第一章（细胞表面）的图26。相关章节的PDF副本可在ASCB的BioEDUCATE网站上获取。