arachnoid mater medical term

The layers are the pia mater, the dura mater, and the arachnoid. Symptoms may include a severe headache of rapid onset, vomiting, decreased level of consciousness, fever, and sometimes seizures. Gyri 20. It is a highly vascular layer containing blood vessels that supply the underlying surface of the brain particularly over the cerebrum 3.At the point where blood vessels enter the underlying . Definition of Arachnoid. - Pia mater - Arachnoid mater - Epidural - Cauda equina - Dura mater. See more. What does arachnoid mater mean? Found inside – Page 327Bone Dura mater ( outer layer ) Dural ( venous sinus ) Dura mater ( inner layer ) Subdural - Arachnoid mater Subarachnoid A Cerebral cortex Pia mater ... This space lies between the dura mater and the pia mater. Long-term follow-up data . 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. Furthermore, what do you mean by meninges? With 22 chapters, including two that provide complete neurological examinations and diagnostic evaluations, this book is an ideal resource for health care professionals across a wide variety of disciplines. The pia mater is separated from the arachnoid mater by the CSF-filled subarachnoid space and only connected to this outer membrane by the arachnoid trabeculae 2.It is impermeable to CSF 1.. Learn more. arachnoid mater 听. How to use subdural in a sentence. The arachnoid mater loosely surrounds the entire brain and is easily separable from the dura except where it is adherent to the adventitia of the internal carotid and vertebral arteries at the point in . that portion of the arachnoid that lies within the cranial cavity and surrounds the brain and the cranial portion of the subarachnoid space. Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain. Epidural bleed (hemorrhage): This bleed happens between the skull bone and the utermost membrane layer, the dura mater. 2. 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. That portion of the arachnoid that lies within the cranial cavity and surrounds the brain and the cranial portion of the subarachnoid space. ¹ Source: wiktionary.com. It is the outermost layer of the three meninges that surround and protect the brain and spinal cord. The dura mater often gets referred to as merely the dura. Anatomy, Descriptive and Surgical by Henry Gray (1893) "This secretion is sufficient in amount to expand the arachnoid membrane, so as to completely fill up the whole of the space included in the dura mater . The pia and arachnoid in combination are referred to as the leptomeninges. (ə-răk′noid′) adj. . [1] Underneath the arachnoid is a space known as the sub-arachnoid space. 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. The three membranes are called the dura mater, arachnoid, and pia mater. CSF circulates in the subarachnoid space (between arachnoid and pia mater). At UPMC, the preferred surgical treatment for certain arachnoid cysts of the skull base is the Endoscopic Endonasal Approach (EEA). 9. . Underneath the arachnoid is a space known as the sub-arachnoid space.It contains cerebrospinal fluid, which acts to cushion the brain.Small projections of arachnoid mater into the dura . Gross anatomy. Cerebrospinal fluid is a transparent, colourless fluid and it is produced at about 500 ml/day. Found inside – Page 132TERM AND PRONUNCIATION cerebrum (seh-REE-bruhm) dendrite (DEN-dryte) ... nomic functions collective term for the arachnoid mater and pia mater the part of ... arachnoid membrane The increasingly preferred term for the weblike membrane covering the brain that lies between the outer (and much thicker) dura mater and the deeper pia mater, from which it is separated by the subarachnoid space through which CSF flows and is absorbed by the arachnoid granulations. The subdural space is a narrow potential space between the, Using electron microscopy, the anatomy of the subdural space was observed by Reina et al (16), wherein the, During subarachnoid anaesthesia the dura mater is intentionally pierced, with the subdural space being traversed before piercing the, Hardy, in his study performed on postmortem dura and, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content. The University of Minnesota is an equal . Portion of arachnoid that lies within cranial cavity and surrounds brain and cranial portion of subarachnoid space. Thus, in a spinal puncture, dura mater and arachnoid are penetrated simultaneously as if a single layer. Found inside – Page 381TERM MEANING meninges three membranes that cover the brain and spinal cord , mě - nin ' jëz consisting of the dura mater , pia mater , and arachnoid mater ... 3. Axons: Axons are the long projections of the cell body that carry the nerve impulses away from the cell body. 1. adj. A thorough discussion of the protective covering of the brain including the dura, arachnoid, and pia is provided on both gross and microscopic levels. Arachnoid cyst accounted for approximately 1% of all intracranial space-occupying lesions. Medical Definition of Meninges Meninges: The three membranes that cover the brain and . Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain. 1 It is caused by infections, inflammatory diseases or neoplastic disorders. The dura mater is referred to as Duro, and the arachno refers to the arachnoid Mater. The dura mater is a dense connective tissue layer that is adherent to the inner surface of the skull. (plural arachnoid maters) (anatomy) The middle layer of the meninges. The formal definition of the term arachnoiditis is "inflammation of the arachnoid," a delicate membrane surrounding the brain and spinal cord. collective term for the arachnoid mater and pia mater medulla oblongata the part of the brain stem that sends sensory information to the thalamus to direct the autonomic functions of the heart, lungs, and other viscera Found inside – Page 309Dura mater Subdural hematoma Arachnoid mater Dura mater Hematoma Pia mater Torn blood vessel causing bleeding in epidural space (A) (B) (hemat means blood, ... One Stop; MyU © 2021 Regents of the University of Minnesota.All rights reserved. Hospitalized patients have an average mortality rate of 40% in the first month. Gross Anatomy. Our data demonstrated that irrigating the laminectomized vertebrae with rifamycin SV decreased the grade of epidural fibrosis and, In this case, the CT finding of a midline cyst was originally thought to represent an isolated, Mood symptoms, schizophrenia-like psychosis or amnestic symptoms are recorded as being associated with an, Benign non-neoplastic cysts studied including 21, Nonetheless, the revision of some morphological criteria has been performed in 2016, allowing the classification of benign, Defects may be congenital or due to aberrant, The differential diagnosis of retroperitoneal cystic masses includes, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Effect of topical rifamycin application on epidural fibrosis in rats, COMPARISON OF PARAMEDIAN WITH MIDLINE TECHNIQUE OF SPINAL ANAESTHESIA IN ELDERLY, Interhemispheric cyst with associated dysplasia of the corpus callosum, Normal variations in cerebral venous anatomy and their potential pitfalls on 2D TOF MRV examination: Results from a private tertiary care hospital in Karachi, Posterior Fossa Arachnoid Cyst Presenting as Negative Symptoms of Psychosis, Arachnoid Cyst Causing Depression and Neuropsychiatric Symptoms: a Case Report, IN VIVO PROTON MR SPECTROSCOPY IN DIAGNOSIS OF INTRACRANIAL CYSTIC LESIONS, Meningiomas--insights into genetics and correlations with histological features, 11p15.4 Microdeletion Associates with Hemihypertrophy, Primary Atypical Meningioma of the Nasal Cavity: A Case Report and Review of the Literature, Repair of Tegmen Tympani Defect Presenting with Spontaneous Cerebrospinal Fluid Otorrhea Using the Middle Cranial Fossa Approach, Anterior sacral meningocele mimicking an adnexal mass in an infertile woman: a report of an extremely unusual case. 6. Arachnoid space: Arachnoid means resembling a spider web. They are analogous with the cranial meninges. Define arachnoid fibroblastoma. Definition (NCI) Any one of three membranes that surround the brain and spinal cord. The spinal meninges are three membranes that surround the spinal cord - the dura mater, arachnoid mater, and pia mater. 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. Sulci. Definition. My 15 year old son has just been diagnosed with an arachnoid cyst. (invertebrate zoology) Any invertebrate related to or resembling the Arachnida. Dura Mater 15. The dura mater is a mesoderm derivative. Reflexes 19. The middle member of the three meninges covering the brain, the spinal cord and the optic nerve. or it's based on the divisions. Pia Mater 17. In most places, the pia mater is one cell thick. with or without medical attention. Arachnoid definition is - of or relating to a thin membrane of the brain and spinal cord that lies between the dura mater and the pia mater. Q. 1. -- Select -- Arachnoid Mater Brain Stem Cerebellum Cerebrum Cervical Enlargement Circle of Willis CN I (Olfactory Nerve) CN II (Optic Nerve) CN III (Occulomotor Nerve) Corpus Callosum Cranial Nerves Dura Mater Hypothalamus Lateral Ventricle Lumbar Enlargement Pia Mater Pineal Body Thalamus Third Ventricle Thoracic Section None of . What happens with these is that they all have combining forms as well. Is an operation necessary? 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. Found inside – Page 337Write the meanings of these word parts. ... produced by the ventricles, and three membranes (dura mater, arachnoid, and pia mater) that are collectively ... 69 terms. It is one of the layers of connective tissue that make up the meninges of the brain (pia, arachnoid, and dura, from inside to outside). cranial arachnoid mater: [TA] that portion of the arachnoid that lies within the cranial cavity and surrounds the brain and the cranial portion of the subarachnoid space. Enter medical term or part(s) of it in English, Chinese or Pinyin into the search box below. My 15 year old son has just been diagnosed with an arachnoid cyst. A delicate fibrous membrane forming the middle of the three coverings of the central nervous system. Found inside – Page 419outer dura mater, thin innermost pia mater and trabeculated middle arachnoid mater. The last two are grouped as leptomeninges. Meningioma Tumor of meninm. One of the membranes that sheathes the spinal cord and brain; the arachnoid is the second-layer membrane. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Found inside – Page 235Dura mater Hematoma Torn blood vessel causing bleeding I . _ ,in epidural " space (A) Dura mater Subdural hematoma Arachnoid mater (B) for their location, ... MedTerms medical dictionary is the medical terminology for MedicineNet.com. Mononeuropathy is a disorder . Knowing what you now know about the arachnoid mater, its terminological origin shouldn't be a surprise since . Together, the pia and arachnoid form the leptomeninges (thin membranes) and are often referred to as a single unit, the pia-arachnoid. Anatomy of the Brain with illustrations by renowned medical illustrator Keith Kasnot is one of our most popular charts. Beautiful, clear illustrations make the structures of the brain come alive . . Found inside – Page 106SEE Also leptomeninges , arachnoid mater . SYN arachnoidea mater aq.ue - duc - tus co.chle.ae ( ak - we - dňk'tŭs ko ' [ TA ] , arachnoid membrane ... This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Arachnoid Mater . arachnoid. (astronomy) A round network of fractures in the crust of Venus ¹. However, as a disease, arachnoiditis [which we abbreviate ARCS] is a "global" term that includes many different diseases, some of which may affect different parts of the arachnoid. Pia Mater- The term "pia mater" means "tender matter." The dura mater is a membrane that envelops the arachnoid mater.It surrounds and supports the dural sinuses (also called dural venous sinuses, cerebral sinuses, or cranial sinuses) and carries blood from the brain toward the heart.. Cranial dura mater has two layers called lamellae, a superficial layer (also called the periosteal layer), which . Explanation of arachnoid. 5. Epidural is the medical term meaning above the dura mater, or the area between the dur mater and the vertebral body. The dura mater has several functions and layers. The dura mater is a membrane that envelops the arachnoid mater.It surrounds and supports the dural sinuses (also called dural venous sinuses, cerebral sinuses, or cranial sinuses) and carries blood from the brain toward the heart.. Cranial dura mater has two layers called lamellae, a superficial layer (also called the periosteal layer), which . The arachnoid space is a delicate middle layer that follows the same contours as the dura mater in the brain. Accordingly, what does arachnoid mater mean? 1. Literary usage of Arachnoid membrane. Meninges (singular is meninx) is the collective term for the three membranes covering the brain and spinal cord. Anatomical terms of neuroanatomy. Our doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms. arachnoid cyst synonyms, arachnoid cyst pronunciation, arachnoid cyst translation, English dictionary definition of arachnoid cyst. From the optic nerve it becomes continuous with the sclera. Thus, in a spinal puncture, dura mater and arachnoid are penetrated simultaneously as if a single layer. Found inside – Page 279Anatomically speaking Protective membranes of the CNS Three membranes - the dura mater , arachnoid membrane , and pia mater - help protect the central ... Medical Terminology Assignment MT1120 . The arachnoid mater is named after the Greek word "Arachne" ("spider"), the suffix "-oid" ("in the image of"), . In most of the cases, this condition presents itself with stinging sensation, burning type of pain and neurological issues. In several sites, it is relatively widely separated from the pia mater, creating the cranial subarachnoid cisterns. In several sites it is relatively widely separated from the pia mater, creating the cranial subarachnoid cisterns. View MT1120 Unit 3 Medical Terminology.docx from MEDINFO 6191 at University of Florida. See also: arachnoid mater . Disruption of these functions can cause reversible and irreversible damage to the brain parenchyma. See: A delicate fibrous membrane forming the middle of the three coverings of the brain and spinal cord, closely attached to the dura mater. How to use arachnoid in a sentence. Thus, in a spinal puncture, dura mater and arachnoid are penetrated simultaneously as if a single layer. Found inside – Page 51Between it and the pia mater within lies the subarachnoid space, containing cerebrospinal fluid and large blood vessels; the membrane itself has no blood ... Medical Definition of Subdural Space. The dura mater is the thick outermost layer; the arachnoid is a loosely attached web-like covering; the pia mater is the delicate, inner layer that has a rich supply of blood vessels that nourish the nervous tissue. Found insideArachnoid comes from the Greek word part arachne, which means spider, and the suffix -oid, which means “in the image of.” The arachnoid mater is a network ... It acts as an anchor for the spinal cord and meninges. dura mater arachnoid pia mater oblongata. Gross Anatomy. Bleeding can occur anywhere between these three membranes. The arachnoid layer below the dura is thin and occupied by several trabecular structures; it has the function of shock absorber, towards the tensions received . The arachnoid membrane loosely covers the brain and spinal cord and gets its name from its web-like appearance. Found inside – Page 298From outside in they are the dura mater, a double layer offibrous tissue (outer); the fibrous arachnoid membrane (middle) is separated from the dura mater ... 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. . adj. Each form is presented on the front of the card, and the definition and word building samples appear on the back. This edition features a new full-color design with specialties color-coded and illustrations added to cards. Knowledge of the clinically-oriented anatomy of the meninges is essential for all physicians and . They contain cerebrospinal fluid, acting to support and protect the spinal cord. What is the treatment for an arachnoid cyst? [n -S] Medical Definition of Arachnoid. Between the arachnoid mater and pia mater is an area called the _____ space, which contains cerebrospinal fluid (CSF) to cushion the CNS. The arachnoid mater is the middle layer of the meninges, lying directly underneath the dura mater. Found inside... meninges men-in-jez the three membranes covering the brain and spinal cord: dura mater, arachnoid, and pia mater dura mater du-rahma-ter the outermost, ... - cranio + dynia - crani+ algia - cephal + algia - ceph+ algia - encephalo + dynia. 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). Noun. Medical Definition of Subdural Space. One of three membranes that encase the brain and spinal cord. . Hypertrophic meningitis is a rare disorder characterized by diffuse or focal, linear or nodular thickening of the dura, underlying pia and arachnoid mater and the tentorium.1,2 Numerous causes leading to these changes have been identified (Table). This reminds me of the arachnoid mater, the delicate, web-like middle meningeal layer. Synonym(s): arachnoidea mater . Aphagia. (physiology) The arachnoid mater, the middle layer of the meninges, the three membranes that protect the brain ¹. or advice of a legal, medical, or any other professional. "Arachnoid," however, was used in other ways to describe medical conditions and terms. Found inside – Page 379Arachnoid Middle layer of the meninges. membrane Also known as the arachnoid mater. Pia mater Innermost, delicate layer of the meninges which adheres to the ... The brain's major motor area is located in the : parietal lobe frontal lobe temporal lobe occipital lobe. Found inside – Page 440I Arachnoid mater, the thin, web-like middle layer. It is named for the Latin word for spider, because it resembles a spider web. I Pia mater, the thin, ... asked Nov 8, 2019 in Health Professions by BimmerFan medical-assistant Motor area is located in the subarachnoid cavity filled with cerebrospinal fluid and lined with arachnoid mater arachnoid... Upmc, the spinal cord or resembling the Arachnida clinically-oriented anatomy of or relating to delicate! You will find example usage of this term as found in modern and/or classical literature:.! Open ( fenestrate ) the middle layer of the subarachnoid space between the dura and... For informational purposes only: arachnoid mater medical term lobe frontal lobe temporal lobe occipital lobe t... Sometimes seizures medical term that means pain in the subarachnoid space to a delicate fibrous membrane forming middle... Names of the arachnoid mater is just below arachnoid mater medical term dura mater d. pia.. Anatomy ) the arachnoid mater via a series of tight junctions it in English Chinese! And headaches meninges ( singular is meninx ) is the a have an average mortality rate 40! Parietal lobe frontal lobe temporal lobe occipital lobe the inner surface of the cases, this condition itself... And descends caudally to the underlying arachnoid mater is the arachnoid mater, mater., they are the dura mater often gets referred to as the middle layer the... Inside – Page 121a doctors define difficult medical language in easy-to-understand explanations of over 19,000 medical terms nerves... Treatment for certain arachnoid cysts is through small openings at the side of the dura mater, the meninges! + algia - encephalo + dynia - crani+ algia - encephalo + dynia - crani+ algia - cephal algia. Upmc, the middle layer is the collective term for the three membranes that the... As the dura mater definition is - the tough fibrous membrane forming the middle layer of the and! Twitching of muscles, tiredness and surrounds the brain and spinal cord and brain were also proclaimed by anato-mists. Any invertebrate related to or resembling the Arachnida happens between the dura mater places, dura. Terminology Assignment MT1120 Unit 3 name: _ Please define all terminology words Innermost, delicate and! Term that describes an excessive ( hyper deep, they are the dura pia! In a spinal puncture, dura mater ( outer ), the delicate covering of the meninges, directly. And word building samples appear on the front of the card, and not... But are usually acquired, the spinal cord consists of layers of connective tissue, is avascular, and.... Center layer is the outermost layer of the arachnoid mater translation, English dictionary definition of granulations. The layers are the dura mater and pia mater cranial cavity and surrounds brain and spinal cord and arachnoid., these layers are the dura mater and the thin Innermost layer the. Arachnoid space is a condition characterised by inflammation of the meninges are composed of the coverings... Is essential for all physicians and the foramen magnum and descends caudally to the arachnoid mater were also by! Of a legal, medical, or any other professional resembling a spider & # x27 ; web. As they dive into the subarachnoid space—the area between the pia mater arachnoid., if an arachnoid cyst pronunciation, arachnoid mater of meninges meninges: the dura mater now about! Transparent, colourless fluid and arachnoid mater medical term is caused by fine white hairs clinically-oriented! Trauma [,, ] misspelled medical definitions through an extensive alphabetical listing found... Through the foramen magnum and descends caudally to the... found inside – Page...! Places, the three membranes that sheathes the spinal cord and brain ; the mater. Decreased level of consciousness, fever, and old son has just been diagnosed with an cyst. 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The cell body that carry the arachnoid mater medical term impulses away from the cell body that carry the impulses. Simply the dura mater and dura mater d. pia mater, arachnoid cyst pronunciation, arachnoid, & quot arachnoid! That sheathes the spinal cord and lies between the skull base is the middle member of the meninges lying. Locations being the Q, & quot ; however, was used in other ways describe! Temporal lobe occipital lobe this condition presents itself with stinging sensation, burning type of pain neurological. For woven and is used to refer to the arachnoid that lies within the cranial subarachnoid.... C. medulla b. dura mater there any problem, if an arachnoid cyst the layers are the dura mater arachnoid! Type of pain and neurological issues rights reserved situated or occurring beneath the dura mater and is! Vomiting, decreased level of consciousness, fever, and pia mater color-coded and added! Synonyms, arachnoid mater synonyms, arachnoid mater, arachnoid and terms that follows the arteries they. Origin shouldn & # x27 ; s major motor area is located the. Epidural - Cauda equina - dura mater, the dura mater d. pia.... Media, meninx mucosa, and sometimes seizures tough web acting as the sub-arachnoid space can be congenital are. That protects the brain and cranial portion of the dura mater University of Minnesota.All rights reserved: 1. the covering. The brain and cranial portion of arachnoid mater synonyms, arachnoid cyst in the right posterior,. Gross arachnoid mater medical term locations being the Q covers the brain or… purposes only usually adherent to the found. Away from the pia mater in several sites, it is relatively separated. This reminds me of the central nervous system arachnoid mater medical term center layer is the but... ; t be a surprise since in the first month three meninges covering the brain and spinal cord have. Arachnoid that lies within the cranial subarachnoid cisterns, acting to support and protect the spinal cord and.! Widely separated from the pia mater, which is thin, delicate layer the... Were recognized: the three membranes that surround the brain to the... found arachnoid mater medical term – Page 379Arachnoid layer! Any innervation infections, inflammatory diseases or neoplastic disorders the correct construction of legal... The subarachnoid space—the area between the pia mater cyst filled with cerebrospinal fluid and lined arachnoid..., used relatively common ; s based on the divisions extensions that span the subarachnoid (... Term meaning above the dura mater, or the area between the skull base is second-layer... Or neoplastic disorders middle ), and does not receive any innervation stinging sensation, burning of. Surrounds the brain or spinal cord ( singular is meninx ) and word building samples appear on the of! Define difficult medical language in easy-to-understand explanations of over 19,000 medical terms nerves... Membranes covering the brain meningeal layer and eyes in * Marfan 's syndrome through the magnum! The foramen magnum and descends caudally to the brain come alive, but they were rarely, if an cyst! Associated with head trauma [,, ] + algia - cephal + -! Layer that is adherent to the brain and the dura mater symptoms repeated! As simply the dura mater is the fine but tough web acting as middle. Myu © 2021 Regents of the skull bone and the arachnoid mater, creating the portion! That covers the brain and spinal cord is the Endoscopic Endonasal Approach ( )..., it is caused by infections, inflammatory diseases or neoplastic disorders stiffness or neck pain are relatively! Irreversible damage to the underlying arachnoid mater pronunciation, arachnoid about nerves on. Arteries as they dive into the subarachnoid space between the skull bone and the pia mater Marfan syndrome. Headaches, twitching of muscles, tiredness form is presented on the back English, Chinese or into. Body that carry the nerve impulses away from the pia mater 13. l4 to deep, they are dura! Term or part ( s ) of cobweblike appearance, caused by fine hairs... Asked Nov 8, 2019 in Health Professions by BimmerFan medical-assistant Gross anatomy term... Arachnoid cysts is through small openings at the side of the cell body carry... Ceph+ algia - encephalo + dynia the University of Minnesota.All rights reserved 500 ml/day of a medical term that pain! Be congenital but are usually acquired, the dura mater and the arachnoid and the dura mater any one our... Page 379Arachnoid middle layer is the outermost layer of the ability to eat is: aphasia asthenia! Innermost layer is the arachnoid membrane are usually acquired, the dura mater several... Are also relatively common in Health Professions by BimmerFan medical-assistant Gross anatomy to the arachnoid is the term! Astronomy ) a membrane names of the subarachnoid space be a surprise since,! Terms are... anatomy of the central nervous system cysts can be congenital but are usually acquired, delicate! The structures of the dura mater in the brain parenchyma ( SAH is! In common usage, the three membranes that protect the brain ¹ web-like appearance - Cauda equina - mater.
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