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Embryology of sea urchin: 8 cells stage

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Legend:

1? fertilization membrane (not visible)
blastomeres (8x in total)
first cleavage plane
second cleavage plane

 
English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
The third cleavage plane is laid perpendicularly to the first two planes (orthogonal; here third cleavage in the same plane as the screen surface). Due to the equal distribution of yolk, all blastomeres have about the same size.
To next stage.
One stage back.

http://www.vcbio.science.ru.nl/en/image-gallery/show/labels/AN0088/print/

last modified: 5 Jun 2014