The edges of the neural groove then move toward each other and fuse, creating a long hollow cylinder, the neural tube which runs beneath the surface of the embryo’s back. The neural tube later differentiates into the spinal cord and brain.
2) Neurulation involves the formation of a structure found only in chordates, the notochord and dorsal hollow nerve cord.
In the third week, neurulation occurs. This stage is marked by the formation of the neural tube along the dorsal axis of the embryo, as well as by the appearance of the first somites, which give rise to the muscles, vertebrae, and connective tissues.
Comments
First of all, "neurulation" does not fit into the last blank, because it's preceded by "the".
"The neurulation" doesn't make sense . . .
I think the development of the brain and spinal cord from the neural tube
is induced by the mesoderm.
1) Neural tube
The edges of the neural groove then move toward each other and fuse, creating a long hollow cylinder, the neural tube which runs beneath the surface of the embryo’s back. The neural tube later differentiates into the spinal cord and brain.
2) Neurulation involves the formation of a structure found only in chordates, the notochord and dorsal hollow nerve cord.
In the third week, neurulation occurs. This stage is marked by the formation of the neural tube along the dorsal axis of the embryo, as well as by the appearance of the first somites, which give rise to the muscles, vertebrae, and connective tissues.