Describe nervous system of earthworm

Explanation

The nervous system of earthworm is ganglionated. Nerve cells unite to form gaglia. The pair of ganglia is located on the ventral side in the posterior part of third segment. It is known as sub pharyngeal ganglionA pair of ganglia is located on ventral side in each segment after 5th segment. It is known as ventral nerve cord.

On the dorsal side of pharynx a pair of ganglia is located in 3rd segment so it is known as super pharyngeal Ganglion. These ganglia are connected to subpharyngeal ganglia through circumpharyngeal connective. This pair of circum pharyngeal is connected with subphryngeal ganglia and suprapharyngeal ganglia form a Nerve ring. The cerebral ganglia along with other nerves in the ring integrate sensory input as well as command muscular responses of the body.