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Earthworm dissection 001
- 1. Earthworm Dissection Lumbricus terrestris Kingdom:Animalia Phylum: Annelida
- 2. Students should Identifythe following • Segments • Septum • Setae • Pharynx • Esophagus • Crop • Gizzard • Intestine • Aortic Arches • Ventral Nerve Cord • Dorsal Blood Vessel • Clittelum • Seminal Vesicles • Seminal Receptacles
- 3. Students should knowthe following terminology • Invertebrate • Castings • Hermaphroditic • Hydrostatic Skeleton • Closed Circulatory System
- 4. Students will usethe following tools for the earthworm dissection • Scalpel • Scissors • Probes – needle • Dissecting Pins • Rubber Padded Dissecting Tray
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- 10. Dissecting Language • Anterior– FRONT • Posterior – BACK • Dorsal – UPPER • Ventral – LOWER • Cross Section – cut through an organism
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- 13. Before you startdissecting, 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
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- 17. Mouth Pin your wormat the tip of the mouth and at its midpoint.
- 18. Start your incision2 cm behind the clittelum. Make sure not to cut too deeply. Continue your cut to the mouth
- 19. Begin to separate theskin using pins
- 20. Pin the skinback as you go along the cut. Angle your pins outward so that are out of the way.
- 21. As you pinthe skin back, take your probe and break the partitions between the segments. These are called Septum.
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- 24. Aortic Arches –Earthworms have 5 pair of these simple hearts.
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