JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
ANATOMY, WORM Anatomy of a triploblastic metazoa worm. From left to right: the anus, sphincter (narrow section), digestive tract (yellow), nerve (connected yellow beads ), ovary (green), muscle layer (dark pink) surrounding the fluid-filled body cavity, and cuticle (external layer). In the head area: the genital pore (dark green dot), heart (red), pharynx (large yellow sphere), cerebral ganglia (two small yellow spheres), and mouth (upper right extremity).
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