primitive streak
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
People Are Reading
First Known Use of primitive streak
1833
Medical Dictionary
primitive streak
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
Learn More about primitive streak
-
Britannica.com: Encyclopedia article about primitive streak
Seen and Heard
What made you want to look up primitive streak? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!