| 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.
SMART Vocabulary: related words and phrases
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
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Substances & structures in the body
Synonym
myelin sheath
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