nt_07. Unmyelinated nerve fibers
(hematoxylin-eosin)
1. Identify longitudinally cut bundles of unmyelinated nerve fibers lying between the neurons of the sympathetic ganglia:
- one or more axons become longitudinally invaginated into the Schwann cell so that each axon is embedded in a channel, invested by the Schwann cell plasma membrane and cytoplasm;
- the Schwann cell plasma membrane becomes apposed to itself along the opening of the channel, thus effectively sealing the axon within an extracellular compartment bounded by the Schwann cell;
- the zone of apposition of the Schwann cell membrane is called the mesaxon.
2. The specimen is studied without drawing
3. Define and write significant features of the specimen