A neuron may originate from neural crest or neural tube. A neuron may have multiple dendrites. A neuron may have multiple axon hillocks. A neuron may contribute presynaptic elements to multiple synaptic terminals. Myelinated and unmyelinated fibers may both be present.
Connective tissue is absent.
The smallest axons generally conduct information about pain and temperature. The smallest axons generally conduct information slowly. The smallest axons would not be visible in a nerve stained only with osmic acid. Cells of neural crest origin. It comprises a large connective tissue capsule around a central nerve fiber.