Tubules and filaments in satellite cells and axons of sensory neurons.

Satellite cells covering the axon hillock region and initial axon process of the neurons of rat and mouse trigeminal ganglia contained numerous parallel microtubules and microfilaments. These were oriented circumferentially to axonal neurofilaments and neurotubules. The latter were sometimes grouped in fascicles. The results suggest a specialized role for the supporting cell in this region and that fascicles of neurotubules are not related to action potential initiation.