arachnoid
- noun
- /əˈræk.nɔɪd/
- Specialized
:
aracnoides
- Domes, coronas, and arachnoids, lava flows, and myriads of other volcanic features all indicate that Venus's interior was, and probably still is, awfully hot.
Examples
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The arachnoid is the middle layer of the meninges that protects the brain and spinal cord.
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And notice that the arachnoid cells have extensions that go right down and attached to the pia, OK?
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OK, so, so there are three of them and the outer one is called the dura, the middle one is called the arachnoid, and the internal one is called the pia.
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The dura, arachnoid, and pia mater are the meninges.
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Again in that category of non neoplastic congenital masses, we may see arachnoid cysts, we may see neurenteric cysts.
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Between the arachnoid and pia mater, there is a space filled with cerebrospinal fluid.
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The three membranes that cover the brain are the dura, arachnoid, and pia mater.
Synonyms
A thin, web-like middle layer that covers the brain and spinal cord
Compounds
- Specialized
A thin, web-like middle layer that covers the brain and spinal cord
Surface Forms
Morphology
arachnoid = arachnid (semi-transparent) = arachno + oid
The form is clearly 'spider-like', but the anatomical sense (the specific meningeal layer) is a specialized extension that learners cannot infer the precise biomedical reference from components alone.
Etymology
Arachnoid for the thin brain covering comes from the Greek arachne 'spider' because this delicate layer looks like a spider's web, so the name helps you remember it is a web-like protective layer.
