The Neural Tube of Vertebrates Develops During Morphogenesis of the Nervous

Question

The neural tube of vertebrates develops during morphogenesis of the nervous system by the:
A)Migration of mesoderm cells
B)Folding of ectoderm tissue
C)Fusion of ectoderm and mesoderm
D)Contraction of the endoderm away from the mesoderm
E)Fusion of endoderm and mesoderm

Accepted Answer

The nervous system starts to develop from midline ectoderm located just above the presumptive notochord.At first,a thickening of cells,called the neural plate,appears along the dorsal surface of the embryo.Then neural folds develop on either side of a neural groove.The coelom appears,and the neural tube is complete.