BIOL302 Study Guide - Neurulation, Neural Groove, Neural Plate
18 May 2013
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Epiblast one of the layers in laminal disk that give rise to embryo proper. Split by small clefts that combine to separate embryonic epiblast from amniotic ectoderm. Ectoderm specification during beginning of blastulation, gastrulation: originate from embryonic epiblast. Give two examples (one could be d-v specification in drosophila; go back and check). Bmp expressed ventrally to induce ectoderm to become epidermis. Dorsal organizer release inhibitor of bmp (noggin, chortin) to block effects of bmp to allow neural tissue to form: without inhibitor only epidermis would form. Dorsal transcription factor induce genes for ventralization, inihibits genes for dorsalization: amount dorsal determine % dorsalization or ventralization. List four stages of primary neurulation in chick embryo. Neurulation = cells from the neural plate form the neural tube, embryo known as neurula during this process: two ways of occurring primary and secondary neurulation (birds and mammal specific)
