Earthworm Dissection
Lumbricus terrestris
Kingdom: Animalia
Phylum: Annelida
Students should Identify the
following
• Segments
• Septum
• Setae
• Pharynx
• Esophagus
• Crop
• Gizzard
• Intestine
• Ao...
Students should know the following
terminology
• Invertebrate
• Castings
• Hermaphroditic
• Hydrostatic Skeleton
• Closed ...
Students will use the following tools
for the earthworm dissection
• Scalpel
• Scissors
• Probes – needle
• Dissecting Pin...
ScalpelScalpel
ScissorsScissors
Probe
Dissecting Pins
Dissecting Pan
Dissecting Language
• Anterior – FRONT
• Posterior – BACK
• Dorsal – UPPER
• Ventral – LOWER
• Cross Section – cut through...
Cross section
Before you start dissecting, find the
following:
• Mouth
• Setae – the bristles used for locomotion.
They are located by r...
Mouth
Sperm Duct
Clittelum
Mouth
Pin your worm at the tip of
the mouth and at its
midpoint.
Start your incision 2 cm behind the
clittelum.
Make sure not to cut too deeply.
Continue your cut to the
mouth
Begin to separate
the skin using pins
Pin the skin back as
you go along the
cut. Angle your pins
outward so that are
out of the way.
As you pin the
skin back, take
your probe and
break the
partitions
between the
segments.
These are called
Septum.
Pharynx
Aortic Arches – Earthworms
have 5 pair of these simple
hearts.
Aortic Arch
Seminal Vesicles
Seminal
Receptacles
Crop
Gizzard
Dorsal Blood
Vessel
Intestine
Ventral Nerve
Cord
Ventral Nerve
Cord
Brain
Nerve Cord
and Brain
Brain
Earthworm dissection 001
Earthworm dissection 001
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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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