Imagine that a researcher is studying a population of nerve cells known as the neural crest. In mice, when these cells fail to f
orm or migrate properly during development, the cranial ganglia and their associated nerves appear small. As a result, these mice do not respond to strong odors, loud noises, and bitter-tasting food. The neural crest likely forms:
The neural crest likely forms: neurons and glia of the peripheral nervous system
The neural crest are bilaterally paired strips of cells arising in the ectoderm at the margins of the neural tube
In the body region, neural crest cells also contribute the peripheral nervous system (both neurons and glia) consisting of sensory ganglia (dorsal root ganglia), sympathetic and parasympathetic ganglia and neural plexuses within specific tissues/organs
The nervous system is made up of specialized cells which includes nerve cells (or neurons) and glial cells (or glia)
Neurons are the basic functional units of the nervous system, and they generate electrical signals called action potentials, which allow them to quickly transmit information over long distances
Glia are also essential to nervous system function, but they work mostly by supporting the neurons
An amputated leg sometimes still giving a fell of leg or pain even though the leg wasn't there anymore. That happened because the nerve fiber that carries the stimulus from that area is still alive. Something might induce the remnant of the nerve to send a signal of pain but the brain interprets the location to be in the removed limb.
