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Worm anatomy refers to the physical structures and internal organs of worms, which are elongated invertebrates that belong to the phylum Annelida or Nematoda. This includes the segmented body, specialized mouthparts, digestive system, reproductive organs, nervous system, and excretory system. Worms lack a skeleton and instead have a hydrostatic skeleton that allows them to move and burrow through soil or aquatic environments. Their bodies are typically covered in a thin, moist cuticle that helps protect against desiccation and regulate gas exchange. Worms come in a variety of shapes and sizes, with adaptations that allow them to thrive in diverse habitats across the world.