| 词汇 | medullary-sheath |
| 释义 | medullary sheath noun[ C ] anatomy specializeduk /mɪˈdʌl.ər.i ˌʃiːθ/ us /ˈmed.lˌer.i ˌʃiːθ//ˈmeʤ.lˌer.i ˌʃiːθ//məˈdʌl.ər.i ˌʃiːθ/ a layer of myelin(= a substance containing a lot of fat) that surrounds and protects some nerves, especially in the brain: The medullary sheath is a fatty matter in a fluid state, which insulates the essential part of the nerve. The fibres of the optic nerve receive their medullary sheaths in about the tenth week after birth. These are associated with a disturbance of the conduction mechanism resulting from changes in the medullary sheath. The medullary sheath consists of fat and neurokeratin. The nerve fibre, on approaching the muscular fibre, suddenly loses its medullary sheath. The brain & nervous system abducens nerve abducent nerve accessory nerve alexithymia allism glossopharyngeal nerve grey matter hemispheric hemispherical hindbrain neurogenic neurogenically neuroglia neuroglial neurohormonal reticular formation rhinencephalon rhombencephalon right brain right-brained You can also find related words, phrases, and synonyms in the topics: Substances & structures in the body Synonymmyelin sheath |
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