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arachnoid
a·rach·noid A0395400 (ə-răk′noid′)adj.1. Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain.2. Of, relating to, or resembling arachnids.3. Covered with or consisting of thin, soft, entangled hairs or fibers resembling those of a cobweb or spider's web.n.1. An arachnid.2. Anatomy A delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.
[New Latin arachnoīdēs, from Greek arakhnoeidēs, cobweblike : arakhnē, spider + -oeidēs, -oid.]arachnoid (əˈræknɔɪd) n1. (Anatomy) the middle of the three membranes that cover the brain and spinal cord. See meninges2. (Zoology) another name for arachnidadj3. (Anatomy) of or relating to the middle of the three meninges4. (Botany) botany consisting of or covered with soft fine hairs or fibres5. (Zoology) of or relating to the arachnidsa•rach•noid (əˈræk nɔɪd)
adj. 1. of or belonging to the arachnids. 2. of or pertaining to the arachnoid. 3. Bot. formed of or covered with long, delicate hairs or fibers. n. 4. the serous membrane forming the middle of the three coverings of the brain and spinal cord. Compare dura mater, meninges, pia mater. [1745–55; < New Latin arachnoīdes < Greek arachnoeidḗs cobweblike. See arachnid, -oid] arachnoidA web-like membrane: the middle of the three meninges covering the brain and spinal cord.Thesaurus| Noun | 1. | arachnoid - the middle of the 3 meningesarachnoid membranemeninges, meninx - a membrane (one of 3) that envelops the brain and spinal cordleptomeninges - the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers | | 2. |  arachnoid - air-breathing arthropods characterized by simple eyes and four pairs of legsarachnidarthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitinArachnida, class Arachnida - a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wingsharvestman, Phalangium opilio, daddy longlegs - spiderlike arachnid with a small rounded body and very long thin legsscorpion - arachnid of warm dry regions having a long segmented tail ending in a venomous stingerfalse scorpion, pseudoscorpion - small nonvenomous arachnid resembling a tailless scorpionwhip scorpion, whip-scorpion - nonvenomous arachnid that resembles a scorpion and that has a long thin tail without a stingerspider - predatory arachnid with eight legs, two poison fangs, two feelers, and usually two silk-spinning organs at the back end of the body; they spin silk to make cocoons for eggs or traps for preyacarine - mite or tick | | Adj. | 1. |  arachnoid - relating to or resembling a member of the class Arachnidaarachnidian, spiderlike, spiderly, spideryzoological science, zoology - the branch of biology that studies animals |
Translationsarachnoid
arachnoid[ə′rak‚nȯid] (anatomy) A membrane that covers the brain and spinal cord and lies between the pia mater and dura mater. (botany) Of cobweblike appearance, caused by fine white hairs. Also known as araneose. (invertebrate zoology) Any invertebrate related to or resembling the Arachnida. arachnoid
arachnoid [ah-rak´noid] 1. resembling a spider's web.2. the delicate membrane interposed between the dura mater and the pia mater, and with them constituting the meninges.a·rach·noid mat·er [TA] a delicate fibrous membrane forming the middle of the three coverings of the central nervous system. In life, the arachnoid (specifically the arachnoid barrier cell layer) is tenuously attached to the externally adjacent dura mater (specifically the dural border cell layer), and no natural space occurs at the dura-arachnoid interface. Thus, in a spinal puncture, dura mater and arachnoid are penetrated simultaneously as if a single layer. Separation of the arachnoid mater from the dura mater (usually through the dural-border cell layer) may result from traumatic or pathologic processes creating what is commonly, but incorrectly, called a subdural hematoma. The arachnoid mater is named for the delicate, spiderweblike filaments that extend from its deep surface, through the cerebrospinal fluid of the subarachnoid space, to the pia mater. See: cranial arachnoid mater, spinal arachnoid mater.
See also: leptomeninx. Synonym(s): arachnoidea mater, arachnoides [TA], arachnoid membrane, arachnoid, parietal layer of leptomeningesarachnoid (ə-răk′noid′)n. A delicate fibrous membrane forming the middle of the three coverings of the brain and spinal cord, closely attached to the dura mater.
a·rach′noid′al adj.
arachnoid (ə-răk′noid′)adj.1. Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain.2. Of, relating to, or resembling arachnids.3. Covered with or consisting of thin, soft, entangled hairs or fibers resembling those of a cobweb or spider's web.n.1. An arachnid.2. Anatomy A delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.arachnoid adjective
(1) Spider-like in appearance
(2) Cobweb-like; covered with or consisting of entangled soft fibres or hair-like material.
noun A member of the arachnid family.arachnoid adjective Like a cobweb, covered with or consisting of entangled soft fibers or hair-like material noun A member of the arachnoid familya·rach·noid mat·er (ă-rak'noyd mā'tĕr) [TA] A delicate fibrous membrane forming the middle of the three coverings of the central nervous system. In life the arachnoid (specifically the arachnoid barrier cell layer) is tenuously attached to the externally adjacent dura mater (specifically the dural border cells) and there is no naturally occurring space at the dura-arachnoid interface. Thus, in a spinal puncture, dura mater and arachnoid are penetrated simultaneously as if a single layer. Separation of the arachnoid mater from the dura mater (usually through the dural border cell layer) may result from traumatic or pathologic processes creating what is commonly, but quite incorrectly, called a subdural hematoma. The arachnoid mater is named for the delicate, spiderweblike filaments that extend from its deep surface, through the cerebrospinal fluid of the subarachnoid space, to the pia mater.
Synonym(s): arachnoidea mater [TA] , arachnoid membrane, arachnoidea, arachnoides.[G. arachnē, spider, cobweb, + eidos, resemblance]arachnoid The delicate middle layer of the three MENINGES covering the spinal cord and brain, lying between the pia mater and dura mater. Unlike the pia mater, the arachnoid bridges over the grooves (sulci) on the surface of the brain and covers many large blood vessels lying in the sulci. Bleeding from any of these vessels causes a subarachnoid haemorrhage. From the Greek arachne , a spider.arachnoid - the middle of the three membranes (see MENINGES that cover the brain and spinal cord.
- see ARACHNID.
ArachnoidOne of the membranes that sheathes the spinal cord and brain; the arachnoid is the second-layer membrane.Mentioned in: Central Nervous System Infectionsarachnoid The middle member of the three meninges covering the brain, the spinal cord and the optic nerve. From the optic nerve it becomes continuous with the sclera. See sclera.Patient discussion about arachnoidQ. What is the treatment for an arachnoid cyst? My 15 year old son has just been diagnosed with an arachnoid cyst. What is the treatment? Is an operation necessary?A. An operation is not always necessary, it depends on the size and location of the cyst. I suggest you take your son to a neurologist or a neurosurgeon for further consult. Q. info on arachnoid cyst in the right posterior fossa A. Basically it's like a small sac filled with fluid. The problem is that the skull is a rigid closed space, which means that if there's something other than the brain, it'll occupy space, usually on expense of the brains' space. These kinds of problems are often referred to as "space occupying lesion".
It's usually congenital (i.e. develops during pregnancy), and even when it cause symptoms they develop slowly.
YOu can read more here (http://en.wikipedia.org/wiki/Arachnoid_cyst)
Q. Is there any problem, if an arachnoid cyst ,2cmx1.5cm size, rostral to cerebellar region left untreated? symptoms: repeated headaches, twitching of muscles, tirednessA. An arachnoid cyst that leads to symptoms usually needs treatment. Mild symptoms as you suggested are ok to left untreated however gradual onset of new symptoms may arise such as seizures, paralysis and other complications, therefore once symptoms occur one should consider treatment. More discussions about arachnoidarachnoid
Related to arachnoid: arachnoid membrane, arachnoid trabeculae, Arachnoid materSynonyms for arachnoidnoun the middle of the 3 meningesSynonymsRelated Words- meninges
- meninx
- leptomeninges
noun air-breathing arthropods characterized by simple eyes and four pairs of legsSynonymsRelated Words- arthropod
- Arachnida
- class Arachnida
- harvestman
- Phalangium opilio
- daddy longlegs
- scorpion
- false scorpion
- pseudoscorpion
- whip scorpion
- whip-scorpion
- spider
- acarine
adj relating to or resembling a member of the class ArachnidaSynonyms- arachnidian
- spiderlike
- spiderly
- spidery
Related Words- zoological science
- zoology
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