PSY290H1 Chapter Notes - Chapter 9: Knockout Mouse, Critical Period, Williams Syndrome
Document Summary
Chapter 9 development of the nervous system. Phases of neurodevelopment: zygote ovum + sperm two daughter cells four and eight cells, cells differentiate (some become muscles, some neurons), find their way to their particular structures, establish relationships with other cells. Patch of ectodermal tissue on the surface of embryo. Ectoderm is the outermost layer of embryonic cells; ectoderm, mesoderm, and endoderm. Development induced by underlying mesoderm layer i. e. the organizer (placing this layer underneath another ectoderm can also induce development) Totipotent earliest embryo cells that can develop into any body cell cells become multipotent as neural plate develops. Cells @ plate are also called embryonic stem cells i. e. capacity for renewal and can develop into different kinds of cells. Neural plate folds neural groove fuses neural tube (this is the eventual cerebral ventricle and spinal cord. Post-40 days to contraception there are forebrain, midbrain, hindbrain swellings visible: neural proliferation. Cells of tube increase in number in unequal parts.
