Nervous system and excretory system of nematode

The excretory system:

The so called “excretory system” is very primitive consisting of a pair of lateral unbranched excretory canal which run throughout the body & connected esophageal region by transverse bridge & then open ventrally through excretory pore. In some nematodes (Aphasmids), there is a single excretory gland cervicoventral in position & open in the midventral line.

The nervous system:

It is entirely enclosed in subcuticular layer & is composed of a circumoesophageal nerve ring associated with several ganglia & a number of longitudinal nerves. preanal ganglia near the anus .Sense organs are cervical papillae & genital papillae.