WordNet

one of a pair; "he lost the mate to his shoe"; "one eye was blue but its fellow was brown" (同)fellow
South American holly; leaves used in making a drink like tea (同)Paraguay tea, Ilex paraguariensis
the officer below the master on a commercial ship (同)first_mate
informal term for a friend of the same sex
South American tea-like drink made from leaves of a South American holly called mate
the partner of an animal (especially a sexual partner); "he loved the mare and all her mates"; "camels hate leaving their mates"
sports equipment consisting of a piece of thick padding on the floor for gymnastic sports (同)gym mat
mounting consisting of a border or background for a picture (同)matting
a small pad of material that is used to protect surface from an object placed on it
a thick flat pad used as a floor covering
a mass that is densely tangled or interwoven; "a mat of weeds and grass"
relating to or resembling a member of the class Arachnida (同)arachnidian, spidery, spiderlike, spiderly
the middle of the 3 meninges (同)arachnoid_membrane
an informal use of the Latin word for mother; sometimes used by British schoolboys or used facetiously

PrepTutorEJDIC

(対をなすものの)『片方』《+『to』(『of』)+『名』》 / 『配偶者』[の一方],連れ合い / (動物の)つがいの片方 / 《英》《しばしば複合語を作って》『仲間』,『友達』 / (商船の船長を補佐する各階級の)航海士 / …の助手 / 〈動物〉‘を'つがわせる / 〈二つのもの〉‘を'結ぶ;(…に)…‘を'調和させる《+『名』+『with』+『名』》 / 〈人・動物が〉(…と)仲間になる,交わる《+『with』+『名』》 / 〈動物が〉交尾する
=checkmate / =checkmate
マテ茶;〈C〉マテ茶の木
(床などに敷く)『マット』,敷物,むしろ,畳 / (花びん・置き物などの)下敷き / (レスリング・体操用の)詰め物をした厚い敷物 / 《a ~》(毛・雑草などの)もつれ《+『of』+『名』》 / 〈床など〉‘に'マットを敷く,‘を'マットで覆う / …‘を'もつれさせる / もつれる
(絵画・写真などの飾り縁にする)台紙,厚紙 / (加工した金属などの)つや消し[面] / つや消しの,表画がつやのない / 〈絵など〉‘に'台紙を付ける / 〈表面〉‘を'つや消しにする,曇らせる

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/17 15:56:20」(JST)

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[Wiki en表示]

The arachnoid mater is one of the three meninges, the protective membranes that cover the brain and spinal cord.

Structure

It is interposed between the two other meninges, the more superficial and much thicker dura mater and the deeper pia mater, from which it is separated by the subarachnoid space. The delicate arachnoid layer is attached to the inside of the dura and surrounds the brain and spinal cord. It does not line the brain down into its sulci (folds), as does the pia mater, with the exception of the longitudinal fissure, which divides the left and right cerebral hemispheres. Cerebrospinal fluid (CSF) flows under the arachnoid in the subarachnoid space. The arachnoid mater makes arachnoid villi, small protrusions through the dura mater into the venous sinuses of the brain, which allow CSF to exit the subarachnoid space and enter the blood stream.

The arachnoid mater and dura mater are very close together throughout the cranium all the way to S2, where the two layers fuse into one layer and terminate. Sandwiched between the dura and arachnoid maters lie some veins that connect the brain's venous system with the venous system in the dura mater.^[1]

The arachnoid mater covering the brain is referred to as the "arachnoidea encephali," and the portion covering the spinal cord as the "arachnoidea spinalis." The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges. ("Lepto"- from the Greek root meaning "thin"). Similarly, the dura in this situation is called the pachymeninx.

There are two subdivisions of arachnoid mater surrounding the subarachnoid space, the dorsal layer and the ventral layer. The dorsal layer covers internal cerebral veins and fixes them to the surrounding tela choroidea. The ventral layer of arachnoid membrane, on the other hand, is a direct anterior extension of this arachnoid envelope that the dorsal layer forms over the pineal region.^[2]

Function

CSF circulates in the subarachnoid space (between arachnoid and pia mater). Cerebrospinal fluid is produced by the choroid plexus (inside the ventricles of the brain, which are in direct communication with the subarachnoid space so the CSF can flow freely through the nervous system). Cerebrospinal fluid is a transparent, colourless fluid and it is produced at about 500 ml/day. Its electrolyte levels, glucose levels, and pH are very similar to those in plasma, but the presence of blood in cerebrospinal fluid is always abnormal.^[3]

History

The arachnoid mater is named after the Greek words "Arachne" ("spider") and suffix "-oid" ("in the image of"), and "mater" (the Latin word for mother), because of the fine spider web-like appearance of the delicate fibres of the arachnoid which extend down through the subarachnoid space and attach to the pia mater.

Additional images

Meninges
Diagrammatic section of scalp.
The arachnoid mater lies under the dura mater, and arteries and veins run on top of it.
Spinal dura mater opened, arachnoid mater visible.
The medulla spinalis and its membranes.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Meninges and superficial cerebral veins.Deep dissection.Superior view.
Meninges and superficial cerebral veins.Deep dissection.Superior view.

References

^ ¨Microscopic Morphology and Histology of the Human Meninges¨. Mar2005. p22-34.
^ "Overview of Adult Traumatic Brain Injuries." Retrieved on 2008-01-16. The Distribution of arachnoid membrane within the velum interpositum". Acta neurochirurgica Sept2012Vol 154 Issue 9, page 1711-1715. Authors: Zhang, Xi-an; Qi, Songtao; Fan, Jun; Huang, Guanglong; Peng, Junxiang; Xu, Jiaming.
^ "The intracranial arachnoid mater". Child's Nervous system; Jan2013, Vol29, Issue 1, p17-33, 17p. Authors: Adeeb, Nimer; Deep, Aman; Griessernauer, Christoph; Mortazavi, Martin; Watanabe, Koichi; Loukas, Marios; Tubbs, R.; Cohen, Aaron.

Orlando Regional Healthcare, Education and Development. 2004. "Overview of Adult Traumatic Brain Injuries." Retrieved on 2008-01-16.

External links

Anatomy figure: 02:05-09 at Human Anatomy Online, SUNY Downstate Medical Center
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English Journal

PMID 25335644

Torticollis in children: an alert symptom not to be turned away.

Tumturk A1, Kaya Ozcora G, Kacar Bayram A, Kabaklioglu M, Doganay S, Canpolat M, Gumus H, Kumandas S, Unal E, Kurtsoy A, Per H.
Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery.Childs Nerv Syst.2015 Jun 5. [Epub ahead of print]
PURPOSE: The aim of this study is to investigate the spectrum of underlying disease in children with torticollis.METHODS: We investigated the spectrum of underlying disease and to evaluate the clinical features of the children presented with torticollis in the last 2 years.RESULTS: Of the 20 childr
PMID 26043711

Neuroendoscopic treatment for hydrocephalus associated to midline arachnoid cysts in a series of nine pediatric patients.

González-García L1, Ros-López B, Ibáñez-Botella G, Romero-Moreno L, Martín-Gallego A, Arráez-Sánchez M.
Minerva pediatrica.Minerva Pediatr.2015 Jun 4. [Epub ahead of print]
AIM: Arachnoid cysts are extra-axial cerebrospinal fluid (CSF) collections surrounded by a membrane. Occasionally, hydrocephalus is associated due to a change in CSF circulatory dynamics. Neuroendoscopic treatment has been recommended for patients who develop symptoms resulting from the cyst locatio
PMID 26041004

Japanese Journal

Distribution of Podoplanin-Expressing Cells in the Mouse Nervous Systems

Tomooka Miwa,Kaji Chiaki,Kojima Hiroshi,Sawa Yoshihiko
ACTA HISTOCHEMICA ET CYTOCHEMICA 46(6), 171-177, 2013
… in the cranial meninges the dura mater, arachnoid, and pia mater; …
NAID 130003381871

前交通動脈瘤に対する interhemispheric approach

野田公寿茂,谷川緑野,上山博康,太田仲郎,薮内伴成,宮田至朗,小坂章,坪井俊之,徳田禎久
脳神経外科ジャーナル = Japanese journal of neurosurgery 21(11), 834-841, 2012-11-20
… It is not easy to dissect the interhemispheric fissure, because visualizing the arachnoid trabeculae between the pia mater and the vessels can be complicated. … The fissure can be separated without pial injury by identifying the microstructure surrounding the major vessels in the pericallosal cistern and the cutting the arachnoid trabeculae. …
NAID 10031131649

Encapsulated Acute Subdural Hematoma Mimicking Acute Epidural Hematoma on Computed Tomography : Case Report

MIKI Shunichiro,FUJITA Keishi,KATAYAMA Wataru,SATO Masayuki,KAMEZAKI Takao,MATSUMURA Akira,SAKASHITA Shingo
Neurologia medico-chirurgica = 神経外科 52(11), 826-828, 2012-11-15
… The arachnoid membrane and the brain parenchyma were intact, and no other abnormal feature such as aneurysm or arteriovenous malformation was observed. … The reported pathological mechanisms of lentiform ASDH are adhesion of the arachnoid membrane and the dura mater or intracapsular bleeding from sinusoidal vessels in the outer membrane of the chronic subdural hematoma. …
NAID 10031125975

Related Pictures

Pictures Of Arachnoid Membrane Arachnoid trabeculae - definition — Neuroscientifically Challenged Pin by Abdal-jabbar Al-rubai on meninges and CSF | Notes inspiration, Anatomy and What is the innermost of the cranial meninges? | Socratic Biology, Animal Structure and Function, The Nervous System, The Central Nervous System Arachnoid mater - Wikipedia PPT - The Meninges PowerPoint Presentation, free download - ID:4876527 Pictures Of Arachnoid Mater

★リンクテーブル★

リンク元	「クモ膜」「脳クモ膜」
関連記事	「mate」

「クモ膜」

Brain: Arachnoid mater
	Coronal view of the brain showing the Arachnoid mater and neighboring anatomical structures.
Gray's	p.876
Part of	Meninges
NeuroNames	ancil-561
MeSH	Arachnoid