Anteriorly, the neural crest extends as far as the roof of the mid-brain.
In any case Marshall has not yet been able again to find an olfactory nerve till long after the disappearance of the neural crest.
The probable explanation of the origin of nerves from the neural crest has already been briefly given (p. 316).
neural crest n.
A band of neuroectodermal cells that lie dorsolateral to the developing spinal cord, where they separate into clusters of cells that develop into dorsal-root ganglion cells, autonomic ganglion cells, chromaffin cells of the adrenal medulla, neurolemma cells, or integumentary pigment cells.