Earthworm Dissection
Lab Notebook
The following assignments are to be completed in your lab notebooks. All notes, diagrams, observations and responses are to be recorded in your lab notebooks.
Earthworm Dissection Pre-lab Complete the questions and diagrams using the diagrams and Reference websites. PART I: EXTERNAL ANATOMY Draw and label the following parts of an earthworm in your lab notebook. a. __ Dorsal End b. __ Ventral End c. __ Setae d. __ Metameres e. __ Clitellum f. __ Anterior “head” region g. __ Caudal Region PART II: INTERNAL ANATOMY Draw and label a diagram of the internal anatomy of an earthworm. A. Internal Organs a. __ Aortic arches b. __ Seminal Vescicles c. __ Crop d. __ Gizzard e. __ Intestine f. __ Dorsal Blood Vessel B. Cross Section a. __ Coelom b. __ Ventral Nerve Cord c. __ Dorsal Blood Vessel PART III: Vocabulary Define each of the body parts identified in each diagram above. There are a total of 16 terms to define. PART IV: Respond to the following questions in your lab notebook. Use the links in the Reference section to help you research the answers. Please watch the Earthworm Dissection video before responding. 1. What is the scientific name of the earthworm? What phylum does the earthworm belong to? 2. Describe the characteristics of Annelids. 3. Explain the difference in the dorsal and ventral sides of the worm. 4. Describe the function of the clitellum. 5. How many pairs of aortic arches does an earthworm have? Describe the circulatory system of an earthworm. 6. What is the name of the earthworm’s brain? 7. Explain the habitat in which earthworms live and what they eat |
Guided Exploration1. Notice the space between the body wall and the internal organs. What do we call this space?
2. What is the benefit of the space listed in #1? 3. What is the function of the pharynx? 4. What is the function of the crop? 5. What is the function of the gizzard? 6. How many pulsating blood vessels or aortic arches (hearts) are present? 7. What is the function of the seminal vesicles? 8. What is the function of the seminal receptacles? 9. What is the function of the nephridia? 10. How does the difference in wall thickness of the crop and gizzard relate to their respective functions? References
Illustrated Guide to Earthworm Dissection
The Phylum Annelida All About Earthworms - Discovery Kids Earthworms - National Geographic Anatomy of an Earthworm - Discovery Kids My Anatomy - Basic Earthworm Anatomy Earthworms Diagrams
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