primitive pit


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Related to primitive pit: Primitive groove, primitive streak, prechordal plate, primitive node

prim·i·tive pit

the depression in the primitive node that serves to connect the notochordal canal with the surface ectoderm.

primitive pit

a minute indentation at the anterior end of the primitive groove in the early developing embryo. It lies posterior to the primitive node and probably functions as an opening into the notochordal canal in humans and higher animals and into the neurenteric canal in lower animals.

primitive pit

A minute depression at the anterior end of the primitive groove or streak and immediately posterior to the primitive knot.
See also: pit