Arizona State University - BIO 467 Neuro Exam 1 (Latest 2021) Correct Study Guide

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Early Development  Embryogenesis – development of the embryo (the earliest form of the organism) o Includes Fertilizations, cleavage, morula, and blastocyst stages o Represents the period of t... ime up to the implantation of the early embryo into the uterine wall by the syntrophoblast  Takes ~8 days until the embryo is implanted into the uterus (posterior uterine wall) o Being to see different areas of development  Inner cell mass – superior pole of the blastocyst; site of development of embryonic cell layers (polarity) o Problems with early stage/implantation  Oocyte can be fertilized too high and become ectopic pregnancy  Fertilization/cleavage o Zygote undergoes division o Inner cell mass forms superiorly and a cystic chamber forms below that’s supportive of embryo  Syncytiotrophoblast – offshoot of the cytotrophoblast and stimulates lacunae formation (vascular supportive tissues)  What contains the inner cell mass and trophoblast  Basically placenta formation  Inner cell mass becomes more defined o Embryonic disk – distinct early division of embryonic cell layers in the inner cell mass; consists of 2 things  Primary ectoderm – forms the roof of the primary yolk-sac  Embryonic endoderm – closely applied to its outer surface facing the amniotic cavity  Happens ~16 days o Extraembryonic Coelom – body cavity that develops around day 12 (space that’s not inner cell mass)  Shrinks down ~ day 13 to help anchor the embryo (connecting stalk) [Show More]

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