PSY290H1 Lecture Notes - Lecture 7: Superior Colliculus, Ependyma, Gastrointestinal Tract

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Brain development: how does the nervous system develop. This does not mean that the brain stops growing after birth: postnatal stage: Inactive synapses degenerate: new synapses are formed after learning, new neurons are produced to only a very limited degree: adult neurogenesis. Development of the nervous system: key steps of prenatal brain developments. Fertilization: fusion of gametes (sperm and egg) to initiate the development of a new organism. Fertilized egg: cell division after nuclei fusion: zygote: fertilized egg, morula: a ball of cells, blastocyst: embryonic structure with cavity. Zygote: the first cell of the human body. Implantation: embedding of blastocyst into uterine lining begins at day 7. Inner cell mass develops into two layers of cells called the blastodisc. Inner cell mass within blastocyst becomes a blastodisc. Blastodisc contains two layers of cells: epiblast, hypoblast. Blastocyst does not have a general body plan (i. e. a-p and d-v axis do not exist) Gastrulation (from two cell layers to three cell layers)

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