However, when Erbacher looked at skin tissue under the microscope, he noticed that nerve fibers did not just grow around skin cells but, to the whole team’s surprise, tunneled straight through them.

Electron microscope image of a nerve fiber with myelin (in black) in the optic nerve of an MS patient. In yellow, the spaces between myelin layers that are enlarged in MS) Disclaimer: AAAS and ...

With the invention of the microscope at the beginning of the seventeenth ... simple reduction to models derived from the cell theory. Nerve-cell bodies, nervous prolongations and nervous fibres ...