Not all neurons are created equal. Some neurons are fast and some are not so. The speed of a neuron is very important in a an evolutionary point of view, because when a lion is trying to hunt you down...Not all neurons are created equal. Some neurons are fast and some are not so. The speed of a neuron is very important in a an evolutionary point of view, because when a lion is trying to hunt you down, you better think fast and run fast. So some neurons are covered by a sheath. The Schwann cells form this sheath and they help in fast conduction of impulses across the nerve.
