NRSC 335 Lecture Notes - Lecture 6: Neural Groove, Neural Tube, Neural Plate
6 Mar 2017
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Embryonic development: development begins with fertilization of egg. In mammals - male contributes 50% and female contributes. 50% of dna: dna from sex cells -> haploid gametes, massive release of calcium into the egg -> forms a cuticle around the egg so no more sperm (dna) can enter, diploid. First step is hensen"s node and primitive streak: becomes a separate, distinct entity from which the nervous system develops, brain development (day 22-24, neural tube differentiations, anterior tube develops brain plate. P rosencephalon: telencephalon, diencephalon, mesencephalon, r hombencephalon, metencephalon. P osterior tube develops into spinal cord: tube cavity develops into ventricles and central canal, brain size increases massively in utero, r apid increase in first 5 years. P eaks between 18 and 30: g radual decline thereafter. In 8th week, head is half the size of the entire embryo. Neurogenesis and brain growth: adult brains increase in size.
