The meninges (singular meninx) are the system of membranes that envelop the central nervous system. The meninges consist of three layers, the dura mater, the arachnoid mater, and the pia mater. It has been suggested that Net flux be merged into this article or section. ... A diagram showing the CNS: 1. ... 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. ... The Arachnoid mater is one of the three layers of the meninges, interposed between the dura mater and the pia mater and separated from the pia mater by the subarachnoid space. ... 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. ...

Anatomy

• The pia or pia mater is a very delicate membrane. It is closest to the brain or the spinal cord. As such it follows all the minor contours of the brain (gyri and sulci). Within the pia mater are capillaries responsible for nourishing the brain.
• The middle element of the meninges is the arachnoid mater, so named because of its spider web-like appearance. The arachnoid mater is filled with cerebrospinal fluid.
• The dura mater is a thick, durable membrane, closest to the skull. It contains larger blood vessels that split into the capilliaries in the pia mater.

The arachnoid and pia mater are sometimes together called the leptomeninges. 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. ... It has been suggested that Net flux be merged into this article or section. ... Comparative brain sizes In animals, the brain, or encephalon (Greek for in the head), is the control center of the central nervous system. ... Cross-section through cervical spinal cord. ... Comparative brain sizes In animals, the brain, or encephalon (Greek for in the head), is the control center of the central nervous system. ... Grays FIG. 726– Lateral surface of left cerebral hemisphere, viewed from the side. ... A sulcus (pl. ... The word capillary is used to describe any very narrow tube or channel through which a fluid can pass. ... The Arachnoid mater is one of the three layers of the meninges, interposed between the dura mater and the pia mater and separated from the pia mater by the subarachnoid space. ... Spider web with morning dew enhancing its visibility. ... Cerebrospinal fluid (CSF) is a clear bodily fluid that occupies the subarachnoid space in the brain (the space between the skull and the cerebral cortex—more specifically, between the arachnoid and pia layers of the meninges). ... 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. ... It has been suggested that Net flux be merged into this article or section. ... A hippopotamus skull A skull, or cranium, is a bony structure of Craniates which serves as the general framework for a head. ... The arachnoid layer is the second or middle layer of the meninges, the membranes surrounding the brain. ... 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. ...

The subarachnoid space is the space that normally exists between the arachnoid and the pia. The meninges (singular meninx) are the system of membranes that contain the brain. ... The arachnoid layer is the second or middle layer of the meninges, the membranes surrounding the brain. ... The name Pia is the feminine version of Pius, meaning pious, dutifull. ...

Normally, the dura mater is attached to the skull in the head, or to the bones of the vertebral canal in the spinal cord. The arachnoid is attached to the dura mater, and the pia mater is attached to the central nervous system tissue. When the dura mater and the arachnoid separate through injury or illness, the space between them is the subdural space. 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. ... A hippopotamus skull A skull, or cranium, is a bony structure of Craniates which serves as the general framework for a head. ... Cross-section through cervical spinal cord. ... The arachnoid layer is the second or middle layer of the meninges, the membranes surrounding the brain. ... 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. ... 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. ... 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. ... The arachnoid layer is the second or middle layer of the meninges, the membranes surrounding the brain. ...

Pathology

There are three types of hemorrhage involving the meninges: To meet Wikipedias quality standards, this article or section may require cleanup. ...

• A subarachnoid hemorrhage is acute bleeding under the arachnoid; it may occur spontaneously or as a result of trauma.
• A subdural hematoma is a hematoma (collection of blood) located in a separation of the arachnoid from the dura mater. The small veins that connect the dura mater and the arachnoid are torn, usually during an accident, and blood can leak into this area.
• An epidural hematoma similarly may arise after an accident or spontaneously.

Other medical conditions that affect the meninges include meningitis (a viral or bacterial infection). Meningiomas are tumors (generally benign) arising from the meninges. Malignant tumors formed elsewhere may also metastasize to the meninges. A subarachnoid hemorrhage (SAH) is bleeding into the subarachnoid space surrounding the brain, i. ... A subdural hematoma, also called a subdural hemorrhage, is a collection of blood between the dura (the outer protective covering of the brain) and the arachnoid (the middle layer of the meninges). ... Hematoma on an elbow, nine days after a blood sample was taken Hematoma on a forearm, one day after repeated shocks A hematoma, or haematoma, is a collection of blood, generally the result of hemorrhage. ... The arachnoid layer is the second or middle layer of the meninges, the membranes surrounding the brain. ... 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. ... 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. ... The arachnoid layer is the second or middle layer of the meninges, the membranes surrounding the brain. ... Nontraumatic epidural hematoma in a young woman. ... Meningitis is inflammation of the membranes (meninges) covering the brain and the spinal cord. ... The human immunodeficiency virus (HIV) A bacteriophage virus A virus is a submicroscopic parasitic particle that infects cells in biological organisms. ... Phyla/Divisions Actinobacteria Aquificae Bacteroidetes/Chlorobi Chlamydiae/Verrucomicrobia Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Nitrospirae Omnibacteria Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Bacteria (singular, bacterium) are a major group of living organisms. ... Meningiomas are tumors arising from the outer part of the arachnoid mater in the meninges of the brain or the spinal cord. ... Tumor (American English) or tumour (British English) originally means swelling, and is sometimes still used with that meaning. ... Metastasis (Greek: change of the state) is the spread of cancer from its primary site to other places in the body. ...

References

1. Orlando Regional Healthcare, Education and Development. 2004. "Overview of Adult Traumatic Brain Injuries."