Immediately beneath the neural tube is situated the notochord (ch).
The enlarged part of the neural tube, forming the hind-brain, is shewn at (hb).
In their mode of attachment to the neural tube an important change has, however, already commenced to be visible.
At its posterior extremity it is primitively continuous with the neural tube (fig. 420), as was first shewn by Kowalevsky.
Later still they become applied closely to the sides of the neural tube and send fibres to it below as well as above.
neural tube n.
A dorsal tubular structure in the vertebrate embryo that develops into the brain and spinal cord.
|neural tube |
A tubular structure that results from the folding of tissue along the back of vertebrate embryos and develops into the brain and spinal cord. Improper folding of the neural tube is the cause of spina bifida and other birth defects.