Internal anatomy of an earthworm (cross section): small, long, cylindrical animal without legs or hard body parts. Epidermis: outer part of the skin. Dorsal blood vessel: blood vessel situated in the rear part of an earthworm.
The following diagram of the earthworm depicts its morphological features:- Earthworms possess a segmented tube-shaped body that is reddish-brown in colour. The body is precisely divided into small segments.
With forceps, grasp the edges of the skin carefully. Pull the skin back so that it can be pinned down revealing the internal anatomy of the worm. Take care not to tear or pin any internal organs. A B C Internal Anatomy