Re: Good start.
No, the dissection is actually finer than that.
Take one C. elegans worm, fix it and embed it in suitable sectioning material. Then use a microtome to cut it into very, very thin salami slices and image each of these under a microscope. Finally, using a computer running much the same software as is used on CT scanners, reconstruct the animal's nervous system in 3D.
Repeat on a few different worms and there you have the nervous system of the brain (actually a nerve ring around the pharynx) of a nematode. Sit back and enjoy.