1. animal pole
    pigment rich, little yolk. polar bodies are given off.
  2. vegetal pole
    lacking pigment, yolk rich
  3. polar bodies
    small cells containing only DNA that soon dissapears
  4. grey cresent
    structure formed on opposite side of sperm entry, will form notochordal mesoderm
  5. ectoderm
    blue, epidermis and nervous system
  6. mesoderm
    red, cardiac/skeletal/smooth muscle, kidney, red blood cells
  7. endoderm
    yellow, digestive track respiration, urinary, auditory, thyroid
  8. blastocoel
    fluid filled region of blastula, early blastulation
  9. blastopore
    structure from invagination
  10. dorsal lip
    gastrulation movements, surface cells move inward. 2/3 down from animal pole and opposite side of sperm entry.
  11. ventral lip
    additional mesoderm and endoderm precursor cells pass over
  12. archentron
    interior cavity when blastocoel collapses, becomes the gut/luman
  13. yolk plug
    yellow, formed during dorsal lip of blastopore exposed at vegetal surface
  14. neural tube
    green, precursor to brain and spinal cord, neural groove deepens as neural folds meet too tube
  15. notochord
    green, forms in neural tube and is spinal tube
  16. neurulation
    change from neural plate to neural tube
  17. somites
    bilateral blocks of mesoderm that forms along neural tube and form skeletal muscle, cartilage, tendons, dermis
  18. neural plate
    opposite primitive streak, ectodermal tissue thickens and flattens
  19. neural fold
    forms at end of neural plate when forcing them together to form tube
  20. remnant of blastocoel
    blastocoel collapsing during late gastrulation and neuralation
  21. neuropore
    forms brain, anterior portion of neural tube
  22. eye vesicle
    out growing of brain through ectoderm
  23. pronephrons
    first of sequence of kidneys in the mesoderm
  24. tail bud
    where tail will form
  25. blastula stage
    follows cleavage and precedes gastrulation
  26. cleavage
    state after fertilization in which the egg divides by mitosis and forms in blastula stage
  27. gastrulation
    follow cleavage, cells rearrange and endoderm and mesoderm cells move inward and ectoderm spreads along outside.
  28. invagination
    folding inward of a sheet of cells
  29. involution
    type of gastrulation in which sheets of cells move inward and spread over inner surfaces
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