PSY 324 Chapter Notes - Chapter 5: Occipital Lobe, Olfactory Bulb, Temporal Lobe
17 Apr 2016
School
Department
Course
Professor
Document Summary
In vertebrate embryos, the cns begins as a tube surrounding a fluid-filled cavity. Proliferation production of new cells (human neurons proliferate longer than chimpanzee brains) Cells lining the ventricles of the brain divide to become neurons and glia + migrate to other locations. Stem cells do not migrate, but continue to divide. Migration neurons move at different paces and radially/tangentially along the brain surface. Neuronal movement is guided by immunoglobulins and chemokines. Deficits in these chemicals cause: decreased brain size/axon growth + mental retardation. Differentiation the axon grows first, and then the dendrites begin to form. Myelination later and slower stage in which glia produce the insulating fatty sheaths (myelin sheaths) that accelerate transmission of neuronal signal in many vertebrate axons. Myelin forms first in the spinal cord and then hindbrain, midbrain, forebrain. Synaptogenesis formation of synapses, begins before birth but continues throughout life. Neurons form new synapses and discard old ones.
