What does myelinated mean?
Myelinated is an adjective describing nerve fibres that are surrounded by myelin, a fatty substance forming an insulating sheath around axons. This covering helps electrical signals travel more rapidly and efficiently along the nervous system. Myelinated fibres are especially important in the brain and spinal cord, where rapid communication is essential. The word is mainly used in neuroscience, medicine, and biology, though it also appears in discussions of nerve injuries and demyelinating diseases. In contrast, unmyelinated fibres lack this sheath and generally conduct impulses more slowly. “Myelinated nerve fibres,” “myelinated axons,” and “myelinated nerve cells” are established technical collocations. The term is closely related to myelin, myelination, and the verb myelinate.
adjectiveCovered or surrounded by myelin, the fatty insulating sheath that surrounds many nerve fibres. Myelinated fibres conduct nerve impulses more rapidly than unmyelinated fibres.
- Having or surrounded by a myelin sheath, the fatty insulating covering around certain nerve fibres.
"The brain contains billions of myelinated nerve fibres that communicate rapidly across different regions."
"Myelinated axons carry signals more quickly than unmyelinated axons."
"The condition affects the myelinated fibres in the brain and spinal cord."
Myelin lets nerve signals travel like electricity along insulated wires, helping the nervous system transmit information at remarkable speed.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does myelinated come from?
The word is formed from myelin plus the suffix -ated, meaning “provided with” or “covered by.” Myelin comes from Greek myelos, meaning “marrow” or “bone marrow,” through the coined medical term myelin. The same general root is reflected in related medical vocabulary connected with marrow and the spinal cord.
Related word forms
How myelinated is actually used
This is primarily a technical term used in neuroscience, medicine, and biology. In British usage, “fibre” is often used, while American usage commonly spells it “fiber.”
Easily confused with myelinated
“Myelinated” describes a fibre that already has a myelin sheath, whereas “myelinating” refers to the process of forming that sheath.