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Earthworm Internal Anatomy Dissection

Earthworm Internal Anatomy Dissection. What you need per group. Dissecting tray (1 per table) Probe (1 per table) Earthworm (1 per table) Earthworm Internal Dissection Lab Worksheet (1 per student) Moisten Paper towel & lay flat onto the dissecting tray

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Earthworm Internal Anatomy Dissection

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  1. Earthworm Internal Anatomy Dissection

  2. What you need per group • Dissecting tray (1 per table) • Probe (1 per table) • Earthworm (1 per table) • Earthworm Internal Dissection Lab Worksheet (1 per student) • Moisten Paper towel & lay flat onto the dissecting tray • Place Earthworm on paper towel CLASSWORK: LABEL CIRCULATORY & DIGESTIVE SYST & Describe the Functions of the Digestive System (STAMP NEEDED)

  3. Lab Members Duties Dissection Team per Table • 1 Surgeon per Earthworm • 1 Reader per Earthworm • 1 Recorder • CLEAN UP DUTIES: EVERYONE HELPS OUT.

  4. What to do when cleaning up? • Wrap worm in the paper towel • Toss paper towel in trash • Return probes, pins, and scissor back to the cart

  5. Prepping Earthworm • Lay worm dorsal side up • Pin down the mouth & tail end of the worm to the tray • Always keep worm moist (to prevent drying) with a small drops of water Pin Pin

  6. Dissecting 101 • Cut worm from the end of the Clitellum towards the mouth • Using a dissecting scissors to cut through skin • Cut to the right of the dorsal blood vessel (dark mid line) Direction of Dissecting

  7. Male Reproductive System(Seminal Vesicles) • Identify and take a picture of the Seminal Vesicles. • Consist of 3 white lobes on both sides • Function: Sperm Storage

  8. Digestive System(The Pharynx) • Using a probe, locate the pharynx • Take picture

  9. Digestive System(The Esophagus) • Using forceps, carefully remove the seminal vesicles, exposing the long tube underneath • Using a probe, locate the esophagus • Take a picture

  10. Digestive System(The Crop) • Using the probe located the crop • Take a picture • Use a probe and gently press against the crop, how does it feel? Answer for 3a. • Function: Stores food

  11. Digestive System(The Gizzard) • Using the probe located the gizzard • Take a picture • Use a probe and gently press against the gizzard, how does it feel compared to the crop? Answer for 3a. • Function: Grinds up food

  12. Digestive System(The Intestine) • Using the probe located the intestine • Take a picture • 80% of the worm’s body consist of the intestine • Function: Absorbs nutrients from food

  13. Circulatory System(5-ringed Heart) • Use a probe to locate the 5-ringed Heart (Black thin rings around from the esophagus) • Take a picture • Function: Pump Blood to blood vessels

  14. Circulatory System(Dorsal Blood Vessel) • Use probe to locate the dorsal blood vessel (black mid line on Dorsal Side) • Take a picture

  15. Circulatory System(Ventral Blood Vessel) • Use forceps to lift the intestine to expose the ventral blood vessel (thin black mid line) • Take a picture

  16. Nervous System(Nerve Cord) • Use forceps to lift the intestine to expose the nerve cord (thin white mid line, next to ventral blood vessel) • Take a picture

  17. CLASSWORK • Answer Analysis & Conclusion Qs (1-4) • Label & Color the Earthworm Diagram • Print Pictures and Label the following 1. Seminal Vesicles 6. Intestine 2. Pharynx 7. Five-ringed heart 3. Esophagus 8. Dorsal Vessel 4. Crop 9. Ventral Vessel 5. Gizzard 10. Nerve Cord

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