White Matter of the Spinal Cord Develops from the ________

Question

White matter of the spinal cord develops from the ________.
A) notochord
B) neuroepithelial layer
C) mantle layer
D) marginal layer
E) neurocoel

Accepted Answer

The white matter of the spinal cord develops from the marginal layer, which consists of axons that originate from neurons in the mantle layer. The marginal layer is the outermost layer of the spinal cord and contains myelinated axons that make up the white matter. The neuroepithelial layer gives rise to the cells of the central nervous system, and the mantle layer gives rise to the cells of the gray matter of the spinal cord. The notochord is a mesodermal structure that gives rise to the intervertebral discs, and the neurocoel is the central cavity of the neural tube that develops into the ventricles of the brain and the central canal of the spinal cord.