Describe the anatomical relationship of the white and gray rami communicantes to the spinal nerve, and indicate the kind of fibers found in each ramus type.

Video transcript

Hey, everyone. Let's take a look at this question together. The white and gray rami communicant are named based on their color, which reflects the myelination status of the nerve fibers. They contain the white rami communicant appear white because they contain, what is it? Answer choice. A nonmyelinated nerve fiber fibers. Answer choice B, myelinated nerve fibers. Answer choice C sensory nerve fibers or answer choice D motor nerve fibers. Let's work this problem out together to try to figure out why the white rami communicant appear white. So when we're talking about the white rami communicant, we note that they contain these myelinated nerve fibers and the myelinated nerve fibers cause the rami communicant to appear as white. Which means that answer choice B, myelinated nerve fibers is the correct answer since the white ramitis appear white because of those myelinated nerve fibers, whereas the gray rami communicant appear as gray because they have those nonmyelinated nerve fibers. So answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.