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Earthworm Dissection Lab

Earthworm Dissection Lab. Problem: What are the internal/external structures of an earthworm? What is the purpose of these structures?. External Structures. External Structures & Words to Know. Anterior - head end of body Posterior - tail end of body Dorsal - back side

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Earthworm Dissection Lab

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  1. Earthworm Dissection Lab Problem: What are the internal/external structures of an earthworm? What is the purpose of these structures?

  2. External Structures

  3. External Structures & Words to Know Anterior- head end of body Posterior- tail end of body Dorsal- back side Ventral- under side Setae- hair-like bristles that aid in movement Clitellum- swelling seen in sexually mature worms that forms eggs

  4. Internal Structures

  5. Pharynx- section after the mouth Esophagus- section after the pharynx that leads to the crop Aortic arches-5 “hearts” that transport blood through the body Crop- stores food Gizzard- grinds up food mixture Intestines- tube where food is digested & nutrients are absorbed. It leads to the anus Septa- threadlike structures that hold the skin to organs Internal Structures & Words to Know

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