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primitive streak |
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primitive streak [′prim·əd·iv ′strēk] (embryology) A dense, opaque band of ectoderm in the bilaminar blastoderm associated with the morphogenetic movements and proliferation of the mesoderm and notochord; indicates the first trace of the vertebrate embryo. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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For example, bioethics commissions in England, Canada, and the United States that have studied embryo status have all recommended drawing the moral line at the development of the so-called primitive streak at about fourteen days, when twinning is no longer possible and the trajectory of individual development has begun. Peter Weir, directing nominee for ``Master and Commander: The Far Side of the World,'' said filmmaking shouldn't be a competitive sport, although the movie awards process certainly elicits a primitive streak in everyone involved. This primitive streak is the first recognizable anatomical differentiation of cells. |
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