PHGY 209 Lecture Notes - Lecture 27: Cerebrospinal Fluid, Choroid Plexus, Arachnoid Granulation

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A single cell is divided into a blastocyst after a week. At this point there is some structure in the blastocyst in which there is a clump of cells on the side called the inner cell mass. The inner cell mass begins to differentiate and divide to form a lining of specialized cells called the embryonic disk (at week 3). At the point of the embryonic disk, the embryo is no longer a ball-shape, but a disk shape (cross section in diagram below). The top layer of cells in the embryonic disk begin to fold up to form the. Development: the neural tube (week 3 and 4) The neural plate is on top of the embryonic disk. The embryonic disk has three layers of cells: Ectoderm: cns: mesoderm: muscle and other tissues. At week 3-4, the neural plate and ectoderm begins to form an indent called the neural groove.

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