The spinal cord begins at the occipital bone and extends down to the space between the first and second lumbar vertebrae; it does not extend the entire length of the vertebral column.
Earthworms are invertebrates, lacking a skeleton. To support and shape the body, they are filled with coelomic fluid. Earthworms sometimes appear to have a belt or saddle around their bodies; this is a clitelum, a structure containing maturing eggs.
Â» Worm Locomotion Explore how an earthworm moves through the dirt. Â» Worm's Digestive System This website describes the physiology and anatomy of the earthworm. The digestive system works well here although esophagus is not spelled the way Americans spell it. Worm Locomotion Explore how an earthworm moves through the dirt. Â» Worm's Digestive System This website describes the physiology and anatomy of the earthworm. The digestive system works well here although esophagus is not spelled the way Americans spell it.