Q.What is the ganglion?

Step 1. Definition. A ganglion is a mass, or cluster, of nerve cell bodies grouped together, typically serving as a relay or processing point along a nerve pathway, distinct from a long, thin nerve fibre that simply carries signals.

Step 2. Examples in the cockroach. The cockroach's nervous system is described as ganglionated precisely because it is built from a whole series of such clusters — the paired cerebral (supra-oesophageal) ganglia that together form the brain, the sub-oesophageal ganglion, the three thoracic ganglia, and the six abdominal ganglia making up the ventral nerve cord, plus the four small ganglia of the autonomous nervous system. …

Give the general definition of a ganglion, then anchor it with the cockroach's own …

• Describing a ganglion as a single nerve fibre or nerve cord rather than a c …