Earthworm dissection 001

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Earthworm dissection 001

  1. 1. Earthworm Dissection Lumbricus terrestris Kingdom: Animalia Phylum: Annelida
  2. 2. Students should Identify the following <ul><li>Segments </li></ul><ul><li>Septum </li></ul><ul><li>Setae </li></ul><ul><li>Pharynx </li></ul><ul><li>Esophagus </li></ul><ul><li>Crop </li></ul><ul><li>Gizzard </li></ul><ul><li>Intestine </li></ul><ul><li>Aortic Arches </li></ul><ul><li>Ventral Nerve Cord </li></ul><ul><li>Dorsal Blood Vessel </li></ul><ul><li>Clittelum </li></ul><ul><li>Seminal Vesicles </li></ul><ul><li>Seminal Receptacles </li></ul>
  3. 3. Students should know the following terminology <ul><li>Invertebrate </li></ul><ul><li>Castings </li></ul><ul><li>Hermaphroditic </li></ul><ul><li>Hydrostatic Skeleton </li></ul><ul><li>Closed Circulatory System </li></ul>
  4. 4. Students will use the following tools for the earthworm dissection <ul><li>Scalpel </li></ul><ul><li>Probes </li></ul><ul><li>Dissecting Pins </li></ul><ul><li>Rubber Padded Dissecting Tray </li></ul>
  5. 5. Scalpel
  6. 6. Probe
  7. 7. Dissecting Pins
  8. 8. Dissecting Pan
  9. 9. Before you start dissecting, find the following: <ul><li>Mouth </li></ul><ul><li>Setae – the bristles used for locomotion. They are located by rubbing your fingers along the earthworm’s body. They are often times easier to feel than to see. </li></ul><ul><li>Sperm Duct </li></ul><ul><li>Clittelum </li></ul>
  10. 10. Mouth
  11. 11. Sperm Duct
  12. 12. Clittelum
  13. 13. Mouth Pin your worm at the tip of the mouth and at its midpoint.
  14. 14. Start your incision 2 cm behind the clittelum. Make sure not to cut too deeply. Continue your cut to the mouth
  15. 15. Begin to separate the skin using pins
  16. 16. Pin the skin back as you go along the cut. Angle your pins outward so that are out of the way.
  17. 17. As you pin the skin back, take your probe and break the partitions between the segments. These are called Septum.
  18. 19. Pharynx
  19. 20. Aortic Arches – Earthworms have 5 pair of these simple hearts.
  20. 21. Aortic Arch
  21. 22. Seminal Vesicles
  22. 23. Seminal Receptacles
  23. 24. Crop
  24. 25. Gizzard
  25. 26. Dorsal Blood Vessel Intestine
  26. 27. Ventral Nerve Cord
  27. 28. Ventral Nerve Cord
  28. 29. Brain
  29. 30. Nerve Cord and Brain
  30. 31. Brain

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