Origin of Vertebrates

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  1. Dorsal hollow nerve chord
    forms from a folding of ectoderm tissue
  2. pharyngeal gill, slits, or pouches
    • orinally used as a filter feeding mechanism
    • ciliated
  3. Post-anal tail
    • propulsion mechanism in chordates
    • tail after the anus
  4. Notochord
    • endoskeleton axis: flexible but not compressible
    • under the dorsal hollow nerve chord
    • where muscles attach
    • filled with water
  5. Proboscis
    • like a cork
    • allows water to flow in if it wants
    • located in acorn worms aka hemichordata
  6. endostyle
    • ventral fold along pharynx
    • mucus carries food particles to stomach
    • eventually becomes thyroid gland
  7. Atrium
    empty space after anus that helps the water flowin urochordata
  8. Tunic
    outside of the urochordata
  9. incurrent/excurrent siphons
    where water goes in and out in urochordata
  10. myomeres
    chevron-shaped muscle segments in euchordates
  11. digestive cecum
    becomes the live in higher chordates
Card Set
Origin of Vertebrates
bio 101 lecture 15
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