Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
The primitive streak is a linear band that appears early in the third week of embryonic development along the dorsal midline of the embryonic disc. It establishes a structural foundation for development along a longitudinal axis, and will eventually give rise to the notochord, a primitive beginning of skeletal development.
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