Arachnoid mater

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The medulla spinalis and its membranes. |- style="text-align: center;" class="hiddenStructure" | colspan="2" |
|- style="text-align: center; line-height: 1;" class="hiddenStructure" | colspan="2" |Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain, etc. |- class="hiddenStructure" |Latin |colspan="2"| |- class="hiddenStructure" | |colspan="2"|[subject #193 ] |- class="hiddenStructure" |Part of |colspan="2"| |- class="hiddenStructure" |Components |colspan="2"| |- class="hiddenStructure" |Artery |colspan="2"| |- class="hiddenStructure" |Vein |colspan="2"| |- class="hiddenStructure" |Acronym(s) |colspan="2"| |- class="hiddenStructure" |NeuroNames |colspan="2"|[ancil-561] |- class="hiddenStructure" |MeSH |colspan="2"|[A08.186.566.166] |- class="hiddenStructure" |Dorlands/Elsevier |colspan="2"|[a_56/12149123] |}
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 and arachnoid membranes are called leptomeninges (Orlando Regional Healthcare, 2004).
The delicate, spiderweb-like 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.

Reference
Orlando Regional Healthcare, Education and Development. 2004. ["Overview of Adult Traumatic Brain Injuries."]
External links
SUNY Figs [02:05-09]
[Slide]

Brain: Arachnoid mater

Meninges of the brain and medulla spinalis

Dura mater - Falx cerebri - Tentorium cerebelli - Falx cerebelli - Arachnoid mater - Subarachnoid space - Cistern - Cisterna magna - Median aperture - Cerebrospinal fluid - Arachnoid granulation - Pia mater

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