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Topic: Arachnoid (brain)

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	Brain - LoveToKnow 1911
		Between the dura mater and the subjacent arachnoid membrane is a fine space containing a minute quantity of limpid serum, which moistens the smooth inner surface of the dura and the corresponding smooth outer surface of the arachnoid.
		At the base of the brain, and opposite the fissures between the convolutions of the cerebrum, the interval between the arachnoid and the pia mater can, however, always be seen, for the arachnoid does not, like the pia mater, clothe the sides of the fissures, but passes directly across between the summits of adjacent convolutions.
		The cell which conducts impulses to the brain from the olfactory membrane in the nose resembles cells in the skin of the earthworm, in that its cell-body lies actually amid the epithelium of the skin-surface and is not deeply buried near or in the central nervous organ.
	www.1911encyclopedia.org /Brain (17173 words)

	Arachnoid Cyst - Skull Base Institute
		Arachnoid cysts are congenital benign fluid collections within the arachnoid membrane-one of the 3 membranous layers that cover the brain and the spinal cord.
		According to their size and location arachnoid cysts may not produce any symptoms and are only discovered incidentally on MRIs of the brain performed for a variety of reasons, or they may enlarge and become symptomatic by exerting pressure on the surrounding brain or by interfering with the dynamics of the CSF circulation.
		Primary or congenital arachnoid cysts are maldevelopmental anomalies and should be differentiated from secondary arachnoid cysts that are rare and result from a variety of such etiologies as trauma and infection.
	www.skullbaseinstitute.com /arachnoid_cyst/arachnoid_cyst.htm (878 words)

	Arachnoid Cysts Information on Healthline
		Arachnoid cysts are sacs that are filled with cerebrospinal fluid and form in the surface region of the brain around the cranial base, or on the arachnoid membrane (one of three membranes that covers the brain and spinal cord).
		Arachnoid cysts can be classified according to their location and by the type of tissue making up the cyst wall (arachnoid connective tissue or glioependymal tissue).
		Cysts that are found in the area of the cerebrum and in the spinal cord tend to be composed of arachnoid tissue, while cysts found in the supracollicular or retrocerebellar regions of the brain tend to be composed of either arachnoid connective tissue or glioependymal tissue.
	www.healthline.com /galecontent/arachnoid-cysts (986 words)

	[No title]
		The arachnoid and the dura are superficial to the pia.
		The pia of the brain is not nearly as adherent to the brain as the pia of the spinal cord.
		Unlike the dura of the spinal cord, the dura of the brain is adherent to the endocranium of the periosteum.
	www.uhmc.sunysb.edu /som/students/2003/Lectures/body17.doc (1527 words)

	Arachnoid Cysts Information Page: National Institute of Neurological Disorders and Stroke (NINDS)
		Arachnoid cysts are cerebrospinal fluid-filled sacs that may develop between the surface of the brain and the cranial base or on the arachnoid membrane - one of the 3 membranes that cover the brain and the spinal cord.
		Symptoms of an arachnoid cyst are related to the cyst size and location.
		Untreated, arachnoid cysts may cause permanent severe neurological damage due to the progressive expansion of the cyst(s)or hemorrhage (bleeding).
	www.ninds.nih.gov /disorders/arachnoid_cysts/arachnoid_cysts.htm (336 words)

	eMedicine - Arachnoid Cyst : Article Excerpt by: Ali Nawaz Khan, MBBS, FRCP, FRCR (Site not responding. Last check: 2007-11-04)
		Arachnoid cysts also occur within the spinal canal, in which arachnoid cysts or arachnoid diverticula may be located subdurally or in the epidural space, respectively.
		Microscopic examination of arachnoid cysts shows that the walls are formed from a splitting of the arachnoid membrane, with an inner and outer leaflet surrounding the cyst cavity.
		Arachnoid cysts usually occur in association with normal arachnoid cisterns, and such cysts are congenital, arising from arachnoid clefts and arachnoid duplications.
	www.emedicine.com /radio/byname/arachnoid-cyst.htm (584 words)

	Arachnoid Cysts (Site not responding. Last check: 2007-11-04)
		Arachnoid cysts are fluid-filled sacs that occur on the arachnoid membrane that covers the brain (intracranial) and the spinal cord (spinal).
		Arachnoid cysts appear on the arachnoid membrane, and they may also expand into the space between the pia mater and arachnoid membranes (subarachnoid space).
		Spinal arachnoid cysts may be associated with progressive weakness of the legs, abnormal side-to-side curvature of the spine (scoliosis), back pain, and involuntary muscle spasms (spasticity) that result in slow, stiff movements of the legs.
	hw.healthdialog.com /kbase/nord/nord989.htm (2298 words)

	eMedicine - Arachnoid Cyst : Article by Ali Nawaz Khan, MBBS, FRCP, FRCR (Site not responding. Last check: 2007-11-04)
		Arachnoid cysts associated with tumors develop as a consequence of CSF loculation surrounded by arachnoid scarring, with expansion of osmotic filtration or via a ball-valve mechanism.
		Arachnoid cysts typically show compression of the subarachnoid space by a cystic structure that may be unilocular or septate and of variable size, although the septa may not always be visible.
		On CT scans, arachnoid cysts are characterized by sharp nonenhancing borders and are isodense to CSF.
	www.emedicine.com /radio/topic48.htm (3696 words)

	BRAIN NEUROTRANSMITTERS
		While the brain and CSF are separated by the somewhat permeable pia mater, the blood-cerebrospinal fluid barrier and the blood-brain barrier (BBB) represent substantial protection for the brain against undesirable blood substances.
		Most of the brain lipid is structural (in myelin or membranes) in contrast to the triglycerides and free fatty acids constituting the fat of other organs.
		Stimulation of brain nicotinic receptors by nicotine from tobacco and arecoline from betal nuts (chewed by a quarter of the population of India) is a source of euphoric addiction for a large segment of the world's population.
	www.benbest.com /science/anatmind/anatmd10.html (6622 words)

	TheFetus.net - Supratentorial arachnoid cyst -Tae-Hee Kwon, MD*, Philippe Jeanty, MD, PhD
		The meninges are portions of the dura mater, arachnoid, and pia mater.
		Arachnoid cyst deeply situated in relation to the basal cisterns or between the cerebral hemispheres may be difficult to differentiate from other lesions such as cystic astrocytoma or hemangioma.
		Robinson RG: Congenital cysts of the brain: Arachnoid malformations.
	www.thefetus.net /page.php?id=138 (1999 words)

	SUNY Stony Brook Pathology Department News
		The arachnoid, a thin membrane, is connected to the underlying pia via wispy connective tissue fibers that resemble spider webs; these give the arachnoid ("spider-like") its name.
		The brain and spinal cord are thus suspended from the dura-arachnoid by the arachnoid trabeculae and are floating in a bath of CSF.
		In areas where the brain and spinal cord surface is relatively far from the dura-arachnoid, the subarachnoid space is enlarged to form cisterns.
	www.path.sunysb.edu /neuropath/normal_brain.htm (1545 words)

	Arachnoid mater - Wikipedia, the free encyclopedia
		The arachnoid mater is one of the three meninges, the membranes that cover the brain and spinal cord.
		The delicate, spiderweb-like (therefore the name) arachnoid layer, attached to the inside of the dura, surrounds the brain and spinal cord but does not line the brain down into its sulci (folds).
		Cerebrospinal fluid flows under this membrane in the subarachnoid space, which is full of the delicate fibres of the arachnoid extending down to attach to the pia mater.
	en.wikipedia.org /wiki/Arachnoid_(brain) (440 words)

	Your Health: Trover Foundation
		The brain is a complex grouping of nerve cells and other structures that help us think, react to the environment, breathe and even fall in love.
		The largest part of the brain is the cerebrum, which lies over all the rest of the portions of the brain.
		The brain and the rest of the nervous system are composed of many different types of cells, but the main one is a cell called the neuron.
	www.stayinginshape.com /4troverfoundation/libv/m14.shtml (4765 words)

	Neuroscience For Kids - tooth
		This protects the brain from movements that may stretch and break brain blood vessels.
		"The meninges PAD the brain." -- Pia; Arachnoid; Dura.
		The word "arachnoid" comes from the Greek words "arachne" and "-oid" which mean "spider-like." The arachnoid was not discovered until 1664 by the Dutch anatomist Gerardus Blasius.
	faculty.washington.edu /chudler/cover.html (226 words)

	Traumatic Brain Injury Glossary
		arachnoid membrane - one of the three membranes that cover the brain; it is between the pia mater and the dura.
		subdural hygroma - a buildup of proteinrich fluid in the area between the dura and the arachnoid membranes, usually caused by a tear in the arachnoid membrane.
		Traumatic brain injury (TBI) is a sudden physical assault on the head.
	www.weitzlux.com /traumaticbraininjury_672.html (1598 words)

	The Meninges
		The meninges, (singular meninx), are three membranous envelopes—the pia mater, the arachnoid, and the dura mater—that surround the brain and spinal cord.
		The pia mater is the meningeal envelope that firmly adheres to the surface of the brain and spinal cord.
		In the region of the brain, particularly, a large number of fine filaments pass from the arachnoid through the subarachnoid space to blend with the tissue of the pia mater.
	www.becomehealthynow.com /article/bodynervousadvanced/813 (809 words)

	Arachnoid Cyst - A Personal Experience (Site not responding. Last check: 2007-11-04)
		In this membrane, several holes were made to allow free movement of brain fluid in/out of the cyst.
		In this way, the brain fluid from the cyst can cummunicate with the rest of your brain, which removes the pressure from the cyst and therefore from your brain.
		Due to the drain, my brain had 'invaded' almost the whole area that was left by the cyst.
	neuro-www3.mgh.harvard.edu /USERSTORIES/ARACHNOIDCYST.HTML (2834 words)

	Blood Brain Barrier CSF Anatomy and Physiology (Site not responding. Last check: 2007-11-04)
		On the external surface of the brain the ependymal cells fold over onto themselves to form a double layered structure, which lies between the dura and pia, this is called the arachnoid membrane.
		The arachnoid membrane is generally impermeable to hydrophilic substances, and its role is forming the Blood-CSF barrier is largely passive.
		The preponderance of choroid plexus is distributed throughout the fourth ventricle near the base of the brain and in the lateral ventricles inside the right and left cerebral hemispheres.
	users.ahsc.arizona.edu /davis/csfanatomy.htm (407 words)

	Endoscopic Neurological Surgery
		Developmental cysts of the brain, or arachnoid cysts, cause symptoms based upon the location and size of the cyst.
		Weakness, decreased cognitive performance, spontaneous hemorrhage, and seizures, are common presentations for individuals with intracranial arachnoid cysts.
		Endoscopic cyst fenestration is a technique that couples the minimally invasive benefits of shunting with the advantage of open fenestration by avoiding shunt implantation.
	www.nyp.org /masc/arachnoid.htm (126 words)

	Arachnoid Cysts, The Johns Hopkins Division of Pediatric Neurosurgery
		Arachnoid cysts are the most common type of brain cyst.
		They are congenital lesions that occur as a result of the splitting of the arachnoid membrane.
		Arachnoid cysts that do not cause symptoms or impact surrounding areas do not require treatment, no matter where they are located or how large they are.
	www.neuro.jhmi.edu /pedsnus/conditions/arachnoid_cysts.htm (250 words)

	UCLA NEUROSURGERY \| Brain Tumor Diseases & Disorders (Site not responding. Last check: 2007-11-04)
		Arachnoid cysts are congenital lesions that arise during development from a splitting of the arachnoid membrane.
		Almost all arachnoid cysts occur in relation to an arachnoid cistern.
		Arachnoid cysts that do not cause significant mass effect or symptoms, regardless of their size and location do not require treatment.
	neurosurgery.ucla.edu /Diagnoses/BrainTumor/BrainTumorDis_7.html (278 words)

	Arachnoid Cysts
		Arachnoid cysts are cerebrospinal fluid-filled sacs that may develop between the surface of the brain and the cranial base or on the arachnoid membrane--one of the 3 membranes that cover the brain and the spinal cord.
		Untreated, arachnoid cysts may cause permanent severe neurological damage due to the progressive expansion of the cyst(s) or hemorrhage (bleeding).
		Medical College physicians practice at Children's Hospital of Wisconsin, Froedtert Memorial Lutheran Hospital, the Milwaukee VA Medical Center, and many other hospitals and clinics in Milwaukee and southeastern Wisconsin.
	healthlink.mcw.edu /article/921384364.html (218 words)

	Sub-Arachnoid
		A sub-arachnoid hemorrhage is a type of Stroke in which there is bleeding into the space just outside of the brain itself, i.e., into the sub-arachnoid space.
		In all, 80-85% of sub-arachnoid hemorrhages are caused by bleeding from aneurysms, abnormal outswelling in the arteries of the brain.
		Vasospasm is a common source of additional brain damage after the initial bleed.
	www.modern-psychiatry.com /sub-arachnoid.htm (1317 words)

	Arachnoid Cysts - WrongDiagnosis.com
		Intracranial or spinal cavities containing a cerebrospinal-like fluid, the wall of which is composed of arachnoidal cells.
		Intracranial arachnoid cysts usually occur adjacent to arachnoidal cistern and may present with HYDROCEPHALUS; HEADACHE; SEIZURES; and focal neurologic signs.
		Spinal arachnoid cysts may be extradural, intradural, or perineural and tend to present with signs and symptoms indicative of a RADICULOPATHY.
	www.wrongdiagnosis.com /a/arachnoid_cysts/intro.htm (434 words)

	Arachnoid granulation - Wikipedia, the free encyclopedia
		Arachnoid granulations (and arachnoid villi) are small protrusions of the arachnoid (the thin second layer covering the brain) through the dura (the thick outer layer).
		They protrude into the venous sinuses of the brain, and allow cerebrospinal fluid (CSF) to exit the brain, and enter the blood stream.
		It has been suggested that the endothelial cells of the venous sinus create vacuoles of CSF, which move through the cell and out into the blood.
	en.wikipedia.org /wiki/Arachnoid_granulation (279 words)

	Brain & Spine Foundation - What is a sub-arachnoid haemorrhage? (Site not responding. Last check: 2007-11-04)
		The brain is covered by a series of membranes, one of which is called the arachnoid (see Figure 1 in printed bound booklet or pdf version).
		In 75% of cases, there is a weakness in the wall of one of the blood vessels supplying blood to the brain.
		Sometimes an aneurysm may press on an important part of the brain and signs that this has happened may develop.
	www.brainandspine.org.uk /information/publications/brain_and_spine_booklets/subarachnoid_haemorrhage/what_is_a.html (339 words)

	Central Nervous System Infections \| AHealthyMe.com
		The outermost membrane, the dura mater, and the next layer, the arachnoid, entirely encase the brain and spinal cord.
		One of the membranes that sheathes the spinal cord and brain; the arachnoid is the second-layer membrane.
		One of the membranes that sheathes the spinal cord and brain; the dura mater is the outermost layer.
	www.ahealthyme.com /topic/topic100586589 (784 words)

	Brain Injury Glossary - Traumatic Brain Injury Attorneys - Head Injury Law Firm - Traumatic Accidents - Wingate, ... (Site not responding. Last check: 2007-11-04)
		Subdural Hygroma - a buildup of protein rich fluid in the area between the dura and the arachnoid membranes, usually caused by a tear in the arachnoid membrane.
		Any results portrayed here were dependent on the facts of that case and the results will differ from case to case.
		Copyright © 2006 Wingate, Russotti and Shapiro - New York Brain Injury Attorneys, Head injury Lawyers, Personal Injury Attorneys, serving the communities of New York City, Manhattan, Queens, Staten Island, Bronx, Brooklyn, Long Island, Westchester County, Rockland County, Nassau County and Suffolk County.
	www.new-york-brain-injury-lawyers.com /head_injury_glossary.shtml (1519 words)

	Arachnoid Cyst, Dr. Jho's Endoscopic Surgery
		When an arachnoid cyst produces symptoms, a surgical treatment has to be considered.
		Preoperaive MR scan, coronal view, shows an arachnoid cyst at the left temporal region (a fl cavity) with brain shift to the right (A).
		Postoperative MR scan, coronal view, reveals reduction of the cyst fluid (fl cavity) and return of the lateral ventricles to normal shape (two triangular fl shadows at the upper center) (B).
	drjho.com /arachnoid_cyst_surgery.htm (198 words)

	arachnoid cyst
		(0.7967) My daughter, age 29, was diagnosed with an arachnoid cyst in her brain stem three years ago.
		It was as a result of loss of function in his hand and migraine headaches that we had a CT scan done and found the cyst.
		I been recently diagnoses with an arachnoid cyst on my brain and is the size of 9cm.
	www.virtualtrials.com /search1.cfm?keystring=arachnoid+cyst (1041 words)

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