Examlex
Based on the study on dread in Module Five,what would people dread most about getting a root canal?
Primitive Streak
Dynamic, constantly changing structure that forms at the midline of the blastodisc in birds, mammals, and some other vertebrates. It is active in gastrulation as cells migrate to a narrow furrow at its center, the primitive groove, and sink into the interior of the embryo. The anterior end of the primitive streak is Hensen’s node.
Epiblast
An early embryo layer from which all the three primary germ layers develop during gastrulation in the formation of a vertebrate body.
Notochord
A flexible rod-like structure in the early stages of embryos in all chordates, providing skeletal support.
Blastocoel
The fluid-filled cavity of a blastula.
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