Subarachnoid

Subarachnoid
Literally, beneath the arachnoid, the middle of three membranes that cover the central nervous system. In practice, subarachnoid usually refers to the space between the arachnoid and the pia mater, the innermost membrane surrounding the central nervous system. The subarachnoid space is a potential space. It normally contains cerebrospinal fluid. A subarachnoid hemorrhage is a bleed into this space. The arachnoid is named for its delicate, spider-web-like filaments that extend from its undersurface through the cerebrospinal fluid in the subarachnoid space to the pia mater. "Arachnoid" comes from the Greek "arachne" meaning spider or cobweb + "eidos" meaning resemblance = spider-web-like.
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Underneath the arachnoid membrane.

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sub·arach·noid .səb-ə-'rak-.nȯid also sub·arach·noid·al -rak-'nȯid-əl adj
1) situated or occurring under the arachnoid membrane <\subarachnoid hemorrhage>
2) of, relating to, or involving the subarachnoid space and the fluid within it <\subarachnoid meningitis>

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sub·arach·noid (sub″ə-rakґnoid) between the arachnoid and the pia mater.

Medical dictionary. 2011.

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Look at other dictionaries:

  • subarachnoid — [sub΄ə rak′noid΄] adj. located in the space between the arachnoid and the pia mater membranes of the brain and spinal cord, that contains the cerebrospinal fluid [a subarachnoid hemorrhage] …   English World dictionary

  • Subarachnoid — Sub a*rach noid, Subarachnoidal Sub*ar ach*noid al, a. (Anat.) Situated under the arachnoid membrane. [1913 Webster] …   The Collaborative International Dictionary of English

  • subarachnoid — “+ adjective Etymology: International Scientific Vocabulary sub + arachnoid : of, relating to, or situated under the arachnoid membrane subarachnoid processes as a. : constituting the space between the arachnoid membrane and the pia mater b …   Useful english dictionary

  • subarachnoid — also subarachnoidal adjective Date: 1843 of, relating to, occurring, or situated under the arachnoid membrane < subarachnoid hemorrhage > …   New Collegiate Dictionary

  • subarachnoid space — n the space between the arachnoid and the pia mater through which the cerebrospinal fluid circulates and across which extend delicate trabeculae of connective tissue * * * the space between the arachnoid and pia meninges of the brain and spinal… …   Medical dictionary

  • Subarachnoid hemorrhage — ICD9|852.0 ICD9|852.1 ICDO = OMIM = 105800 MedlinePlus = 000701 eMedicineSubj = med eMedicineTopic = 2883 eMedicine mult = eMedicine2|neuro|357 eMedicine2|emerg|559 MeshID = D013345 Subarachnoid hemorrhage (SAH, pron en|ˌsʌbəˈræknɔɪd ˈhɛm(ə)rɪdʒ) …   Wikipedia

  • Subarachnoid space — Infobox Anatomy Name = Subarachnoid space Latin = spatium subarachnoideum, cavum subarachnoideale GraySubject = 193 GrayPage = 876 Caption = Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain …   Wikipedia

  • Subarachnoid hemorrhage — Bleeding within the head into the space between two membranes that surround the brain. The bleeding is beneath the arachnoid membrane and just above the pia mater. (The arachnoid is the middle of three membranes around the brain while the pia… …   Medical dictionary

  • SubArachnoid Space — Infobox musical artist Name = SubArachnoid Space Img capt = Img size = Landscape = Background = group or band Alias = Origin = San Francisco, California, United States Genre = Psychedelic rock Years active = 1996–present Label = Charnel Release… …   Wikipedia

  • subarachnoid haemorrhage — sudden bleeding into the subarachnoid space surrounding the brain, which causes severe headache with stiffness of the neck. The usual source of such a haemorrhage is a cerebral aneurysm that has burst. The diagnosis is confirmed by CT scan or by… …   Medical dictionary

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