Nervous Systems
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  • John's Phyla
    • Cnidaria >
      • The Moon Jelly - Aurelia aurita
      • The Portuguese Man-of-war - Physalia physalis
      • The Gorgonian Wrapper -Nemanthus annamensis
    • Echinodermata >
      • The Sea Star - Astropecten aranciacus
      • The Purple Sea Urchin - Strongylocentrotus purpuratus
      • The Pineapple Sea Cucumber - Thelenota ananas
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      • The Blue Morpho Butterfly - Morpho menelaus
      • The American lobster - Homarus americanus
      • The Common Housefly - Musca domestica
  • Santino's Phyla
    • Chordata >
      • The Killer Whale - Orcinus orca
      • The Leopard - Panthera pardus
      • The Blue Jay - Cyanocitta cristata
    • Annelida >
      • The Earthworm - Lumbricus terrestris
      • The Leech - Hirudo medicinalis
      • The Bristle Worm - Ophiodromus flexuosus
    • Mollusca >
      • The Common Octopus - Octopus vulgaris
      • The Hard Clam - Mercenaria mercenaria
      • The Sea Snail - Littorina obtusata
  • Vincent's Phyla
    • Porifera >
      • The Fire Sponge - Tedania ignis
      • The Green finger Sponge - Iotrochota birotulata
      • The Breadcrumb Sponge - Halichondria panicea
    • Platyhelminthes >
      • The Tiger Flatworm - Maritigrella crozieri
      • The New Zealand Flatworm - Arthurdendyus triangulatus
      • The Blue Garden Flatworm - Caenoplana coerulea
    • Nematoda >
      • Soybean Cyst Nematode - Heterodera glycines
      • Southern Root-Knot - Meloidogyne incognita
      • Whipworm - Trichuris trichiura

The Leech
(
Hirudo medicinalis)

The Leech

The Leeches' nervous system is made by two cerebroid ganglion including  a peri-oesophageal collar to a sub-oesophageal nerve mass, as well as a sucker. The ventral nervous system, located within the ventral sinus, consists of 19 pairs of ganglions, with one per metamere (one of a series of similar body segments).
Picture
Picture
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