Worm Anatomy

Worm Anatomy. The very first section of the anterior contains the mouth and prostomium. Earthworms bodies are made up of ringlike segments called annuli.

Branching worm with dividing internal organs growing in sea sponge. Locate the mouth of the worm on the far anterior end of the wormThe openings toward the anterior of the worm are the sperm ducts. The alimentary canal is a long tube running from first to the last segment of the body.

Pin the cranial and caudal ends.

Incise beyond the clitellum then extend the cut to both ends from the middle out. Earthworms lack a. A mouth at the front end of the earthworm leads to what amounts to a long tube where the organic matter and dirt from the worms diet pass through until it exits the other end. There is a small tongue-like lobe just above the mouth called the prostomium see figure 1.