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Encyclopedia > Spiral cleavage

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In embryonic development at the third cleavage the halves are oblique to the polar axis and typically produce an upper quartet of smaller cells that come to be set between the furrows of the lower quartet. Spiral Cleavage is on of two types of holoblastic or complete cleavage. All groups showing spiral cleavage are protostomia.


  Results from FactBites:
 
Cleavage and Blastulation (1252 words)
Cleavage is the process after fertilization when early mitotic cell divisions occur that progressively reduce cell size.
The symmetry of cleavage is further divided into subtypes such as radial or spiral, depending on the position of the yolk.
Spiral cleavage is yet another symmetry of cell divisions that occurs in mollusks and roundworms.
Cleavage (embryo) - Wikipedia, the free encyclopedia (602 words)
In embryology, cleavage is the division of cells in the early embryo.
Radial cleavage is characteristic of the deuterostomes, which inlude some vertebrates and echinoderms, in which the spindle axes are parallel or at right angles to the polar axis of the oocyte.
In spiral cleavage, the cleavage planes are oriented obliquely to the polar axis of the oocyte.
  More results at FactBites »


 

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