Figure 1123

Ependymal lining of the spinal canal, a. Photomicrograph of the center region of the spinal cord stained with toluidine blue. The arrow points to the central canal. x20. b. At higher magnification, ependymal cells, which line the central canal, can be seen to consist of a single layer of columnar cells. x340. (Courtesy of Dr. George D. Pappas.) c. Transmission electron micrograph showing a portion of the apical node of Ranvier (showing axon in contact with extracellular space)

perinodal cytoplasm of oligodendrocyte axon

nerve fibers oligodendrocyte

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