primitive streak


primitive streak

noun

Definition of PRIMITIVE STREAK

:  an elongated band of cells that forms along the axis of a developing fertilized egg early in gastrulation and that is considered a forerunner of the neural tube and nervous system

First Known Use of PRIMITIVE STREAK

1854

primitive streak

noun    (Medical Dictionary)

Medical Definition of PRIMITIVE STREAK

: an elongated band of cells that forms along the axis of an embryo early in gastrulation by the movement of lateral cells toward the axis and that develops a groove along its midline through which cells move to the interior of the embryo to form the mesoderm

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