That nervous elements migrate peripherally from the neural tube, during early embryonic development, has been observed by several investigators. Harrison ('01) called attention to medullary cells migrating into the ventral nerve roots of embryos of the salmon. Bardeen ('03) observed that "in mammals, as well as in the lower vertebrates, a certain number of cells wander out from the spinal ganglia and cord along with the bundles of axis-cylinder processes. "In his work on embryos of the chick, Carpenter ('06) has shown that cells of an indifferent character migrate from the ventral wall of the mid-brain along the oculomotor nerve and become transformed into nerve cells of the ciliary ganglion. In a more recent paper Carpenter and Main ('07) have described the migration of medullary cells into the ventral nerve-roots of embryos of the pig.
Proceedings of the Iowa Academy of Science
©1909 Iowa Academy of Science, Inc.
"The Migration of Nervous Elements into the Dorsal and Ventral Nerve-Roots of Embryos of the Pig,"
Proceedings of the Iowa Academy of Science, 16(1), 217-220.
Available at: https://scholarworks.uni.edu/pias/vol16/iss1/28