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Web-like middle layer of the three meninges
The arachnoid mater (or simply arachnoid) is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is so named because
Arachnoid_mater
Three membranes protecting the brain
three meninges have been clearly identified: the dura mater, the arachnoid mater, and the pia mater. Each layer has its own molecularly distinct type of
Meninges
Outermost layer of the protective tissues around the central nervous system (meninges)
allow blood to drain from the brain. The dura covers the arachnoid mater and the pia mater, the other two meninges, in protecting the central nervous
Dura_mater
Meningeal structure
spinal cord. Pia mater is medieval Latin meaning "tender mother". The other two meningeal membranes are the dura mater and the arachnoid mater. Both the pia
Pia_mater
Protrusions of the arachnoid mater for returning cerebrospinal fluid to circulation
Arachnoid granulations (also arachnoid villi, and Pacchionian granulations or bodies) are small outpouchings of the arachnoid mater and subarachnoid space
Arachnoid_granulation
Hematoma usually associated with traumatic brain injury
causes bleeding into the subarachnoid space between the arachnoid mater and the pia mater. SAHs are often seen in trauma settings or after rupture of
Subdural_hematoma
the arachnoid mater and the pia mater. They are found within the subarachnoid space where cerebrospinal fluid is also found. Arachnoid trabeculae are
Arachnoid_trabeculae
Topics referred to by the same term
Arachnoid (botany), referring to organs with a cobwebby exterior appearance Arachnoid granulation, small protrusions of the arachnoid mater Arachnoid
Arachnoid
Clear, colorless bodily fluid found in the brain and spinal cord
blood flow. CSF occupies the subarachnoid space (between the arachnoid mater and the pia mater) and the ventricular system around and inside the brain and
Cerebrospinal_fluid
Localized bleeding outside of blood vessels
and dura mater Subdural hematoma – between the dura mater and arachnoid mater Subarachnoid hematoma – between the arachnoid mater and pia mater (the subarachnoid
Hematoma
Inflammation of the arachnoid mater
Arachnoiditis is an inflammatory condition of the arachnoid mater or 'arachnoid', one of the membranes known as meninges that surround and protect the
Arachnoiditis
Congenital malformation of the cerebellar vermis
development or inflammation of the arachnoid mater in the posterior fossa have been put forward. The arachnoid mater contains granulations necessary to
Dandy–Walker_malformation
Inflammation of membranes around the brain
pia mater is a delicate impermeable membrane that firmly adheres to the surface of the brain, following all the minor contours. The arachnoid mater (so
Meningitis
Spaces around the brain filled with cerebrospinal fluid
two meninges, the arachnoid mater and the pia mater. These cisterns are filled with cerebrospinal fluid (CSF). Although the pia mater adheres to the surface
Subarachnoid_cisterns
Central organ of the human nervous system
the tough dura mater; the middle arachnoid mater and the more delicate inner pia mater. Between the arachnoid mater and the pia mater is the subarachnoid
Human_brain
Bleeding into the brain's subarachnoid space
bleeding into the subarachnoid space—the area between the arachnoid membrane and the pia mater surrounding the brain. Symptoms may include a severe headache
Subarachnoid_hemorrhage
Bleeding within the skull
tearing of the bridging veins in the subdural space between the dura and arachnoid mater. It can cross the suture lines, but not across dural reflections such
Intracranial_hemorrhage
Potential space in the outer covering of brain
between the dura mater and arachnoid mater. Under normal conditions, there is no pre-formed anatomical space between the dura and arachnoid. In pathological
Subdural_space
Cavities within the human brain
meninges, the three protective membranes of the tough dura mater, the arachnoid mater and the pia mater. The cerebrospinal fluid (CSF) within the skull and spine
Ventricular_system
Part of the vertebral column in animals
vessels. The arachnoid mater, the middle protective layer, is named for its open, spiderweb-like appearance. The space between the arachnoid and the underlying
Spinal_cord
Topics referred to by the same term
mater in Wiktionary, the free dictionary. Mater is a formal Latin term for mother and may refer to: Mater, Belgium, a village near Oudenaarde Mater Hospital
Mater
Space between the dura mater and vertebrae
periosteal layer of the dura mater adheres to the inner surface of the skull bones while the meningeal layer lays over the arachnoid mater. Between them is the
Epidural_space
Serious trauma to the cranium
between the dura and arachnoid mater. Head CT shows crescent-shaped deformity Subarachnoid hemorrhage, which occur between the arachnoid and pia meningeal
Head_injury
Brain region
Publishing, PMID 32491772, retrieved 2026-06-24 "Meninges | Dura mater - Arachnoid mater - Pia mater | Geeky Medics". geekymedics.com. 2020-06-14. Retrieved 2026-06-24
Infratentorial_region
barrier Meningeal coverings Dura mater Arachnoid mater Pia mater Epidural space Subdural space Subarachnoid space Arachnoid septum Superior cistern Cistern
List of regions in the human brain
List_of_regions_in_the_human_brain
Collection of cerebrospinal fluid (CSF), without blood, located under the dural membrane
to accumulate in the subdural space, resulting in the hygroma. The arachnoid mater is torn and cerebrospinal fluid (CSF) from the subarachnoid space accumulates
Subdural_hygroma
Neoplasm in the brain
covering is composed of (from the outside in) the dura mater, arachnoid mater, and pia mater. The arachnoid and pia are physically connected and thus often considered
Brain_tumor
Fold in the surface of the brain
the sulci. The pia mater, the membrane surrounding the brain follows the surface of the brain into each sulcus, but the arachnoid mater stretches across
Sulcus_(neuroanatomy)
Development in 3rd to 8th week of gestation
midbrain and hindbrain, cartilage, bone, dentin, tendon, dermis, pia mater and arachnoid mater, sensory neurons, and glandular stroma. Pharyngeal arches are
Face and neck development of the human embryo
Face_and_neck_development_of_the_human_embryo
Protein-coding gene in the species Homo sapiens, named for ketazocine
spinal ganglia prefrontal cortex Top expressed in decidua basalis arachnoid mater gastrula superior frontal gyrus wall of uterus lumbar subsegment of
Κ-opioid_receptor
Blood vessel
emerge in the brain and lie in the subarachnoid space. They pierce the arachnoid mater and the meningeal layer in the dura and drain into the cranial dural
Great_cerebral_vein
Passage through the vertebral column containing the spinal cord
meninges, the dura mater, is closely associated with the arachnoid mater which in turn is loosely connected to the innermost layer, the pia mater. The meninges
Spinal_canal
State of medically-controlled temporary loss of sensation or awareness
Backflow of cerebrospinal fluid through a spinal needle after puncture of the arachnoid mater during spinal anesthesia
Anesthesia
Bow-shaped canal in the temporal bone
It is fairly short. Dura mater forms a sleeve within Dorello's canal, forming an outer wall. There may also be arachnoid mater. This contains the abducens
Dorello's_canal
Ligaments of the spine
of denticulate ligaments arise in the pia mater and are firmly attached to the arachnoid mater and dura mater at the apex. The denticulate ligaments extend
Denticulate_ligaments
Death of a region of brain cells due to poor blood flow
tissue but still within the skull, and precisely between the arachnoid mater and pia mater (the delicate innermost layer of the three layers of the meninges
Stroke
Type of electrophysiological monitoring
cerebrospinal fluid (CSF), pia mater, and arachnoid mater before reaching subdural recording electrodes placed just below the dura mater (outer cranial membrane)
Electrocorticography
leptomeninges, the two deep layers of the meninges called the pia mater and the arachnoid mater. Their diameter has been measured at approximately 300 micrometers
Leptomeningeal collateral circulation
Leptomeningeal_collateral_circulation
neurons. Arachnoid mater The middle of the three layers of the meninges that surround the brain and spinal cord, located between the dura mater and the
Glossary_of_neuroscience
Structure between the cerebellum and pons
the cerebellopontine angle cistern. The pia mater follows the outline of the fissure and the arachnoid mater continues across the divide so that the subarachnoid
Cerebellopontine_angle
Italian scientist and anatomist
meningeal layer of the brain, the dura mater. Pacchioni's granulations (or Pacchionian bodies), where the arachnoid layer protrudes through the dura, are
Antonio_Pacchioni
Form of neuraxial regional anaesthesia
patient wide awake. In spinal anesthesia, the needle is placed past the dura mater in subarachnoid space and between lumbar vertebrae. In order to reach this
Spinal_anaesthesia
Space inside the skull formed by eight cranial bones known as the neurocranium
central nervous system developed, which are the pia mater, the arachnoid mater, and the dura mater. The latter is the thickest and outermost of the three
Cranial_cavity
Northern Irish boxer
brain, but in a space between the brain and the skull – called the arachnoid mater – and that he saw no reason for him to give up his boxing career. Nevertheless
Wayne_McCullough
Medication injected into the epidural space of the spine
with the inner surface of the dura is another membrane called the arachnoid mater, which contains the cerebrospinal fluid. In adults, the spinal cord
Epidural_administration
Organ central to the nervous system
arteries pierce the outer two layers of the meninges, the dura and arachnoid mater, into the subarachnoid space and perfuse the brain parenchyma via arterioles
Brain
Tumor of the pituitary gland
from the subarachnoid space by the diaphragma sella, therefore the arachnoid mater and thus cerebral spinal fluid cannot enter the sella turcica.[citation
Pituitary_adenoma
Lower part of the spinal cord
nerves continue to branch out diagonally, forming the cauda equina. The pia mater that surrounds the spinal cord, however, projects directly downward, forming
Conus_medullaris
Region of the brain that processes visual information
Micrograph showing the visual cortex (pink). The pia mater and arachnoid mater including blood vessels are seen at the top of the image. Subcortical white
Visual_cortex
Way certain tissues are arranged in layers
brain and spinal cord. These membranes are the dura mater, arachnoid mater, and pia mater. The dura mater has two layers a periosteal layer near to the bone
Laminar_organization
Medical condition
bobble-head doll syndrome from the presence of a suprasellar cyst in the arachnoid mater of the meninges. It, too, obstructs the foramen of Monro. The presence
Bobble-head_doll_syndrome
Injury of the brain from an external source
dura mater, the outermost of the three membranes surrounding the brain. In subdural hematoma, bleeding occurs between the dura and the arachnoid mater. Subarachnoid
Traumatic_brain_injury
Blood injected epidurally to resolve a cerebrospinal fluid leak
with the inner surface of the dura is another membrane called the arachnoid mater, which contains the cerebrospinal fluid. In adults, the spinal cord
Epidural_blood_patch
Subarachnoid cistern formed in front of each temporal lobe
or Sylvian cistern) is an elongated subarachnoid cistern formed by arachnoid mater bridging the lateral sulcus between the frontal, temporal, and parietal
Cistern of lateral cerebral fossa
Cistern_of_lateral_cerebral_fossa
Hearing loss caused by an inner ear or vestibulocochlear nerve defect
vestibulocochlear nerve Meningioma – benign tumour of the pia and arachnoid mater Ménière's disease – causes sensorineural hearing loss in the low frequency
Sensorineural_hearing_loss
Neoplasms located in either the vertebral column or the spinal cord
layers known as the spinal meninges. These are the dura mater, arachnoid mater, and pia mater. Spinal cord tumors are classified based on their location
Spinal_tumor
1st Argentine Minister of Health
cerebral tumors and the inflammations of the innermost brain envelope (arachnoid mater) known as arachnoiditis. He also proposed a widely used, pre-DSM classification
Ramón_Carrillo
Study of brain evolution using brain endocasts
rarely exhibit convolutions due to buffering by the pia mater, arachnoid mater, and dura mater that once surrounded and protected the brain tissue. Furthermore
Paleoneurobiology
Deep groove separating the two cerebral hemispheres of the vertebrate brain
surface of the brain. All three meninges of the cortex (dura mater, arachnoid mater, pia mater) fold and descend deep down into the longitudinal fissure
Longitudinal_fissure
Venous channels in the dura mater
of dura mater in the brain. They receive blood from the cerebral veins, and cerebrospinal fluid (CSF) from the subarachnoid space via arachnoid granulations
Dural_venous_sinuses
Medical subspecialty
by the surrounding vertebrae) lying outside the dura mater (which encloses the arachnoid mater, subarachnoid space, the cerebrospinal fluid, and the
Interventional_radiology
Medical condition
can affect all germ layers of the CNS, but are most common in the arachnoid mater, and the ventricular space, which may block CSF pathways.[citation
Central_nervous_system_cyst
Blood vessels
the sphenoparietal sinus. It is adherent to the deep surface of the arachnoid mater bridging the lateral sulcus. It drains the adjacent cortex. At its
Middle_cerebral_veins
Numerical technique for bioelectromagnetic modeling
mesoscale head topologies such as thin brain membranes (dura mater, arachnoid mater, and pia mater). This is particularly important for accurate transcranial
Charge based boundary element fast multipole method
Charge_based_boundary_element_fast_multipole_method
Medical condition
a collection of blood between the inner layer of the dura mater and the arachnoid mater of the meninges surrounding the brain; c) testicular hydrocele
Fibrin-associated diffuse large B-cell lymphoma
Fibrin-associated_diffuse_large_B-cell_lymphoma
with adipose tissue, and it contains a network of blood vessels. The arachnoid mater is the middle protective layer. Its name comes from the fact that the
Neuromere
Vein channel in the brain
hemispheres to the confluence of sinuses. Cerebrospinal fluid drains through arachnoid granulations into the superior sagittal sinus and is returned to the venous
Superior_sagittal_sinus
the dura mater and the skull), subdural hematoma (in the subdural space) and subarachnoid hemorrhage (between the arachnoid mater and pia mater). Most of
Pediatric_stroke
Medical condition
laceration is a brain injury in which the pia-arachnoid is torn. Epidural hemorrhage is bleeding between the dura mater and the skull. It is commonly associated
Focal and diffuse brain injury
Focal_and_diffuse_brain_injury
Protein-coding gene in the species Homo sapiens
brains of humans and other mammals and DP1 receptors are located on arachnoid mater trabecular cells in mouse basal forebrain. The PGD2-DP1 pathway is
Prostaglandin_DP1_receptor
Pathologic overview
are called (from the outside to the inside) the dura mater, the arachnoid mater and the pia mater. The cerebrospinal fluid flows between the second and
Pathology of multiple sclerosis
Pathology_of_multiple_sclerosis
Proposed fourth meningeal layer
Proulx, Steven T.; Engelhardt, Britta (2023-09-20). "VE-cadherin in arachnoid and pia mater cells serves as a suitable landmark for in vivo imaging of CNS
Subarachnoid lymphatic-like membrane
Subarachnoid_lymphatic-like_membrane
Fibrous tissue supporting the spinal cord
terminale is formed by spinal pia mater within a dilated dural sac, while the lower portion is formed by both pia and dura mater (with the outer dural layer
Filum_terminale
Abnormal increase in cerebrospinal fluid in the ventricles of the brain
reabsorbing CSF. Reabsorption occurs at the arachnoid granulations, so issues with reabsorption can occur because of arachnoid granulation impairment. There is also
Hydrocephalus
Procedure to collect cerebrospinal fluid
pushing the arachnoid membrane out towards the dura. Therefore, once the needle has pierced the dura mater it has also traversed the thinner arachnoid membrane
Lumbar_puncture
Medical condition
meaning 'fine' or 'slight') describes the thin meninges, the arachnoid and the pia mater, between which the cerebrospinal fluid is located. The disorder
Leptomeningeal_cancer
three membranes are the dura mater, the arachnoid and the pia mater. Between the arachnoid and the underlying pia mater is the subarachnoid space, which
Kay's Tutor v Ayrshire & Arran Health Board
Kay's_Tutor_v_Ayrshire_&_Arran_Health_Board
Cranial nerve III, for eye movements
brainstem, the nerve is invested with a sheath of pia mater, and enclosed in a prolongation from the arachnoid. It passes between the superior cerebellar (below)
Oculomotor_nerve
Cranial nerve connecting the eye to the brain
optic nerve is ensheathed in all three meningeal layers (dura, arachnoid, and pia mater) rather than the epineurium, perineurium, and endoneurium found
Optic_nerve
Nerve origin in the medulla
passes, lying in the same sheath of dura mater as the vagus, but separated from it by a fold of the arachnoid. In the jugular foramen, it receives one
Spinal root of accessory nerve
Spinal_root_of_accessory_nerve
Tumor of the membranes surrounding the brain and spinal cord (meninges)
to be able to form from a number of different types of cells including arachnoid cells. Diagnosis is typically by medical imaging. If there are no symptoms
Meningioma
into a massive sea serpent over centuries. The Spider One of the awnsheghlien, a goblin who became an arachnoid monster, and regent of The Spiderfell.
List of Advanced Dungeons & Dragons 2nd edition monsters
List_of_Advanced_Dungeons_&_Dragons_2nd_edition_monsters
Medical condition
Cerebrospinal fluid, which fills the subarachnoid space between the arachnoid membrane and the pia mater surrounding the brain, is normally clear and colorless. When
Xanthochromia
Medical condition
Other names Benign recurrent lymphocytic meningitis Meninges of the central nervous system: dura mater, arachnoid, and pia mater. Specialty Neurology
Mollaret's_meningitis
Anatomical structure
equina exists within the lumbar cistern, a gap between the arachnoid membrane and the pia mater of the spinal cord, called the subarachnoid space. Cerebrospinal
Cauda_equina
immunoreactive substance P from putative afferent nerve endings in bovine pia arachnoid". Neuroscience. 9 (4): 809–814. doi:10.1016/0306-4522(83)90269-5. ISSN 0306-4522
Trigeminovascular_system
Surgical operation on skull
of CSF shunts; endoscopic third ventriculostomy (ETV); fenestration of arachnoid cysts. Skull base or cranial nerve decompression: resection of skull base
Craniotomy
Brain blood supply
cava. The veins puncture the relevant dural sinus, piercing the arachnoid and dura mater as bridging veins that drain their contents into the sinus. The
Cerebral_circulation
Space surrounding blood vessels
cryptococcosis multiple sclerosis mucopolysaccharidoses neurocysticercosis arachnoid cysts neuroepithelial cysts Perivascular spaces are distinguished on an
Perivascular_space
Leakage of fluid surrounding the brain and spinal cord through tears in the dura mater
brain and spinal cord leaks out of one or more holes or tears in the dura mater. A CSF leak is classed as either spontaneous (primary), having no known
Cerebrospinal_fluid_leak
Structural defect in the cerebellum of the brain
such as tumors, subdural hematomas or other subdural fluid collections, arachnoid cysts, craniosynostosis (early closure of the cranial sutures)(especially
Chiari_malformation
Species of fungus
dull green in color (beige to greyish green on the reverse side), with arachnoid (with many spider-web-like fibers) colony margins. Another characteristic
Penicillium_roqueforti
Network of lymphatic vessels parallel to the sinuses
the cribriform plate and into the lymphatics of the nasal mucosa, and arachnoid granulations to clear itself of excess protein, fluid, and metabolic waste
Meningeal_lymphatic_vessels
Species of fungus
slightly bluish green at the base. The veil is well developed as a white arachnoid mass, but not forming any annulus on the stem. The trama or flesh is pallid
Psilocybe_tasmaniana
tentacle ends in a big sharp claw. Krykna are large, pale-white six-legged arachnoid arthropods native to the planet Atollon, large enough to be aggressively
List_of_Star_Wars_creatures
Medical intervention
Chiasmatic and Hypothalamic gliomas Germinomas Tuber Cinereum Hamartomas Arachnoid cysts Neurinomas of the trigeminal nerve Some suprasellar tumors invade
Endoscopic_endonasal_surgery
Possible consequences of a brain injury
complication of TBI. They may occur outside of the dura mater, below the dura, below the arachnoid (meningitis), or within the brain itself (abscess). Most
Complications of traumatic brain injury
Complications_of_traumatic_brain_injury
Species of spider
ISSN 2045-2322. PMC 6754431. PMID 31541123. Chamberlain, G (1947). "Arachnoidism as applied to New Zealand spiders; a preliminary note". Records of the
Desis_marina
Brazilian agronomist, zoologist and naturalist
Forest and the biggest primate of the Americas, the Muriqui (Brachyteles arachnoids). During the 1960s, he undertook many expeditions to study the life and
Álvaro_Coutinho_Aguirre
Medical condition
Meninges IgG4-related pachymeningitis (dura mater), IgG4-related leptomeningitis (arachnoid and pia mater) Idiopathic hypertrophic pachymeningitis Chest
IgG4-related_disease
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