Information about Arachnoid Mater
| Brain: | ||
|---|---|---|
| The medulla spinalis and its membranes. | ||
| Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain, etc. | ||
| subject #193 876 | ||
| Part of | Meninges | |
| NeuroNames | ancil-561 | |
| MeSH | Arachnoid | |
| Dorlands/Elsevier | a_56/12149123 | |
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.
The portions covering the brain and spinal cord are called arachnoidea encephali and arachnoidea spinalis, respectively.
The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges. (Lepto- from the root meaning thin in Greek). Similarly, the dura in this situation is called the pachymeninx.
Etymology
Arachnoid is from a Greek root, and means cob web like. The mater designation (meaning mother in Latin) is borrowed from the dura mater and pia mater, which were Latin translations of Arabic terms. While mater does not technically belong with the arachnoid layer, it has nevertheless been adopted by it for uniformity with the other meninges, and arachnoid mater is currently the Terminologia Anatomica international standard.Additional images
) Meninges of the CNS | ) Diagrammatic section of scalp. |
References
- Orlando Regional Healthcare, Education and Development. 2004. "Overview of Adult Traumatic Brain Injuries."
External links
See also
Anatomy: meninges of the brain and medulla spinalis | |
|---|---|
| Layers | Dura mater (Falx cerebri, Tentorium cerebelli, Falx cerebelli) • Arachnoid mater (Arachnoid granulation) • Subarachnoid space • Pia mater |
| Cisterns | Cisterna magna • Pontine cistern • Interpeduncular cistern • Chiasmatic • Lateral cerebral fossa • Great cerebral vein |
| Other | Cerebrospinal fluid |
Anatomy of torso (primarily): the spinal cord | |
|---|---|
| Spinal nerve | Dorsal (Root, Ganglion, Ramus) • Ventral (Root, Ramus) • Sympathetic trunk • rami communicantes (Gray, White) |
| Gray matter/Rexed laminae | Posterior horn (Column of Clarke, Substantia gelatinosa of Rolando, Nucleus proprius) • Lateral horn • Anterior horn • Central canal/Substantia gelatinosa centralis |
| White matter: somatic/ascending (blue) | |
| White matter: motor/descending (red) |
Lateral: Corticospinal (Lateral) • Ep (Rubrospinal, Olivospinal)
Anterior: Corticospinal (Anterior) • Ep (Vestibulospinal, Tectospinal, Reticulospinal)
|
| Layers | Epidural space • Dura mater • Subdural space • Arachnoid mater • Subarachnoid space • Pia mater |
| Other structures | Denticulate ligaments • Conus medullaris • Cauda equina • Filum terminale • Cervical enlargement • Lumbar enlargement • Anterior median fissure |
spinal chord is a thin, tubular bundle of nerves that is an extension of the central nervous system from the brain and is enclosed in and protected by the bony vertebral column.
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skull is a bony structure found in many animals which serves as the general framework for the head. The skull supports the structures of the face and protects the head against injury.
The skull can be subdivided into two parts: the cranium and the mandible.
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The skull can be subdivided into two parts: the cranium and the mandible.
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The meninges (singular meninx) is the system of membranes which envelop the central nervous system. The meninges consist of three layers: the dura mater, the arachnoid mater, and the pia mater.
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NeuroNames is a system of nomenclature for the human and/or macaque brain.
It is maintained by the University of Washington and is a part of a tool called "BrainInfo". BrainInfo helps one identify structures in the brain.
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It is maintained by the University of Washington and is a part of a tool called "BrainInfo". BrainInfo helps one identify structures in the brain.
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Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. Created and updated by the United States National Library of Medicine (NLM), it is used by the MEDLINE/PubMed
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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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The meninges (singular meninx) is the system of membranes which envelop the central nervous system. The meninges consist of three layers: the dura mater, the arachnoid mater, and the pia mater.
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In animals, the brain or encephalon (Greek for "in the skull"), is the control center of the central nervous system, responsible for behavior. The brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing,
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spinal chord is a thin, tubular bundle of nerves that is an extension of the central nervous system from the brain and is enclosed in and protected by the bony vertebral column.
..... Click the link for more information.
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The dura mater (from the Latin "hard mother"), or pachymeninx, is the tough and inflexible outermost of the three layers of the meninges surrounding the brain and spinal cord. (The other two meningeal layers are the pia mater and the arachnoid mater.
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The pia mater (Latin: "tender mother", itself a translation from Arabic) is the delicate innermost layer of the meninges - the membranes surrounding the brain and spinal cord.
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- For the anatomy term, see Subarachnoid space.
SubArachnoid Space is a San Francisco-based psychedelic rock band founded in 1996 by Mason Jones, the owner of the independent music label Charnel Music.
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A sulcus (pronounced with a hard c) (pl. sulci) is a depression or fissure in the surface of an organ, especially the brain.
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Examples of sulci
In the brain
See Sulcus (neuroanatomy)Elsewhere
- sulcus arteriæ vertebralis
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Cerebrospinal fluid (CSF), Liquor cerebrospinalis, is a clear bodily fluid that occupies the subarachnoid space and the ventricular system around and inside the brain.
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In animals, the brain or encephalon (Greek for "in the skull"), is the control center of the central nervous system, responsible for behavior. The brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing,
..... Click the link for more information.
..... Click the link for more information.
spinal chord is a thin, tubular bundle of nerves that is an extension of the central nervous system from the brain and is enclosed in and protected by the bony vertebral column.
..... Click the link for more information.
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Terminologia Anatomica (TA) is the international standard on human anatomical terminology. It was developed by the Federative Committee on Anatomical Terminology (FCAT) and the International Federation of Associations of Anatomists (IFAA).
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The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City.
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Arachnoid cyst
Classification & external resources
ICD-10 Q 04.6
ICD-9 348.0
OMIM 207790
DiseasesDB 33219
eMedicine radio/48
MeSH D016080 Arachnoid cysts
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Classification & external resources
ICD-10 Q 04.6
ICD-9 348.0
OMIM 207790
DiseasesDB 33219
eMedicine radio/48
MeSH D016080 Arachnoid cysts
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Human anatomy is primarily the scientific study of the morphology of the adult human body.[1] It is subdivided into gross anatomy and microscopic anatomy.[1]
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The meninges (singular meninx) is the system of membranes which envelop the central nervous system. The meninges consist of three layers: the dura mater, the arachnoid mater, and the pia mater.
..... Click the link for more information.
..... Click the link for more information.
In animals, the brain or encephalon (Greek for "in the skull"), is the control center of the central nervous system, responsible for behavior. The brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing,
..... Click the link for more information.
..... Click the link for more information.
spinal chord is a thin, tubular bundle of nerves that is an extension of the central nervous system from the brain and is enclosed in and protected by the bony vertebral column.
..... Click the link for more information.
..... Click the link for more information.
The dura mater (from the Latin "hard mother"), or pachymeninx, is the tough and inflexible outermost of the three layers of the meninges surrounding the brain and spinal cord. (The other two meningeal layers are the pia mater and the arachnoid mater.
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The falx cerebri, so named from its sickle-like form, is a strong, arched fold of dura mater which descends vertically in the longitudinal fissure between the cerebral hemispheres.
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The tentorium cerebelli or cerebellar tentorium (Latin: "tent of the cerebellum") is an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes.
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The falx cerebelli is a small triangular process of dura mater, received into the posterior cerebellar notch.
Its base is attached, above, to the under and back part of the tentorium; its posterior margin, to the lower division of the vertical crest on the inner surface of
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Its base is attached, above, to the under and back part of the tentorium; its posterior margin, to the lower division of the vertical crest on the inner surface of
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Arachnoid granulations (or arachnoid villi) are small protrusions of the arachnoid (the thin second layer covering the brain) through the dura (the thick outer layer).
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- For the anatomy term, see Subarachnoid space.
SubArachnoid Space is a San Francisco-based psychedelic rock band founded in 1996 by Mason Jones, the owner of the independent music label Charnel Music.
..... Click the link for more information.
The pia mater (Latin: "tender mother", itself a translation from Arabic) is the delicate innermost layer of the meninges - the membranes surrounding the brain and spinal cord.
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