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 • Segments • Septum • Setae • Pharynx • Esophagus • Crop • Gizzard • Intestine • Aortic Arches • Ventral Nerve Cord • Dorsal Blood Vessel • Clittelum • Seminal Vesicles • Seminal Receptacles
  3. 3. Students should know the following terminology • Invertebrate • Castings • Hermaphroditic • Hydrostatic Skeleton • Closed Circulatory System
  4. 4. Students will use the following tools for the earthworm dissection • Scalpel • Scissors • Probes – needle • Dissecting Pins • Rubber Padded Dissecting Tray
  5. 5. ScalpelScalpel
  6. 6. ScissorsScissors
  7. 7. Probe
  8. 8. Dissecting Pins
  9. 9. Dissecting Pan
  10. 10. Dissecting Language • Anterior – FRONT • Posterior – BACK • Dorsal – UPPER • Ventral – LOWER • Cross Section – cut through an organism
  11. 11. Cross section
  12. 12. Before you start dissecting, find the following: • Mouth • 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. • Sperm Duct • Clittelum
  13. 13. Mouth
  14. 14. Sperm Duct
  15. 15. Clittelum
  16. 16. Mouth Pin your worm at the tip of the mouth and at its midpoint.
  17. 17. Start your incision 2 cm behind the clittelum. Make sure not to cut too deeply. Continue your cut to the mouth
  18. 18. Begin to separate the skin using pins
  19. 19. Pin the skin back as you go along the cut. Angle your pins outward so that are out of the way.
  20. 20. As you pin the skin back, take your probe and break the partitions between the segments. These are called Septum.
  21. 21. Pharynx
  22. 22. Aortic Arches – Earthworms have 5 pair of these simple hearts.
  23. 23. Aortic Arch
  24. 24. Seminal Vesicles
  25. 25. Seminal Receptacles
  26. 26. Crop
  27. 27. Gizzard
  28. 28. Dorsal Blood Vessel Intestine
  29. 29. Ventral Nerve Cord
  30. 30. Ventral Nerve Cord
  31. 31. Brain
  32. 32. Nerve Cord and Brain
  33. 33. Brain

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