nt_07a. Unmyelinated nerve fiber
(transmission electron microscopy, х73000; J.A.G.Rodin,1963)
1. General characteristics:
- unmyelinated nerve fibers consist of axons invaginated into a Schwann cell so that each axon is embedded in a channel, invested by the Schwann cell plasma membrane and cytoplasm;
- each axon is surrounded by a mesaxon, a pair of parallel plasma membranes of a Schwann cell.
2. Notations (a сross section):
- 1 - the axial cylinder,
- 2 - the neurolemmocyte nucleus,
- 3 - the neurolemmocyte cytoplasm,
- 4 - the сell membrane of the Schwann cell,
- 5 - the mesaxon.
3. The specimen is studied without drawing