THEATER 335 Lecture Notes - Lecture 5: Growth Cone, Cell Adhesion Molecule, Impulsivity
Document Summary
Impact of the environment on the pre-natal brain development. Growth and development of the brain: zygote fertilized egg. Ectoderm the outer layer from which the nervous system and skin develops: as the cell layers thicken, they grow into a flat overall plate. Endoderm: 20 days: uneven rates of cell division at the head end form the neural groove. Which will become the midline: 22 days: the ridges of the groove come together to form the neural tube. Correspond to the future forebrain (prosencephalon consisting of the telencephalon and the diencephalon), midbrain (mesencephalon) and hindbrain (rhombencephalon consisting of the metencephalon and myelencephalon) Interior of neural tube become fluid-filled cerebral ventricles of the brain, the central canal of the spinal cord and the passages connect them: end of 8th week: embryo shows the rudimentary beginnings of most body organs. Head is half the size of the embryo: embryo during the first 10 weeks, fetus 10 weeks after the fertilization until birth.
