Ectoderm Quiz

From Embryology

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{Ectoderm refers only to the neural plate region of the trilaminar embryo |type="()"} - true + false || The entire layer of the trilaminar embryo is the ectoderm (meaning outer layer), the neural plate is only the central portion of this layer.

Here are a few simple questions that relate to early ectoderm development. Take the quiz and see what you know, if you get some wrong, try working through through the Embryology Lecture on Ectoderm.

{The central nervous system forms in the sequence: |type="()"} - norochord to neural plate to neural tube - neural tube to neural plate to neural groove + neural plate to neural groove to neural tube - neural plate to neural crest to neural zone ||The sequence neural plate to neural groove to neural tube represents the gradual folding of a flat surface sheet of ectodermal cells into a closed tube isolated from the embryo surface. The notochord is part of the mesoderm and regulates the initial overlying differentiation process. The neural crest are a population at the edge of the neural plate that do not get incorporated into the neural tube. I think I made up neural zone.

{The neural plate is narrower at the caudal (tail) end and therefore closes earlier than the broad cranial (head) end. |type="()"} - true + false || The caudal or posterior neuropore closes after the cranial or anterior neuropore.


{The correct sequence from cranial to caudal of the secondary brain vesicles is: |type="()"} - prosencephalon, mesencephalon, metencephalon, myelencephalon, rhombencephalon - telencephalon, diencephalon, metencephalon, mesencephalon, myelencephalon + telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon - prosencephalon, diencephalon, mesencephalon, myelencephalon, metencephalon ||The prosencephalon and rhombencephalon are primary brain vesicles. The others are distractors using your lack of understanding of what the terms mean.

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