primitive pit การใช้

A primitive pit forms as a depression in the centre of the primitive node which connects to the notochord which lies directly underneath.
The epiblast in that region moves down into the streak at the location of the primitive pit where the process called differentiate into various cell types.
The primitive pit in Hensen s node, at the anterior end of the primitive streak, allows cells to enter which will form the notochord and prechordal plate.
Tires had to be pried off of the rims, remounted, and inflated-all using hand tools, and in the precarious confines of the primitive pit stalls.