Why do relay neurons not have a myelin sheath?
Also, do relay neurons have a myelin sheath?
Relay neurons are found in the brain and spinal cord and allow sensory and motor neurons to communicate. Most axons are surrounded by a myelin sheath (except for relay neurons) which insulates the axon so that the electrical impulses travel faster along the axon.
Additionally, why do interneurons not have myelin sheath? Hi Zhou, as a rule interneurons have shorter axons, when compared to the principal (projections) neurons. They unlikely to travel on a long distance and therefore are not myelinated.
Simply so, which neurons do not have a myelin sheath?
SENSORY NEURONS (a.k.a. afferent neurons) receive information from the environment (via the PNS) and relay it to the CNS. They usually have a single long axon connecting to sensory organs. They may or may not have a myelin sheath on their axons.
Why do some neurons have myelin sheaths?
The Myelin Sheath of a neuron consists of fat-containing cells that insulate the axon from electrical activity. This insulation acts to increase the rate of transmission of signals. A gap exists between each myelin sheath cell along the axon.