What is arachnoid

Arachnoid tissue, a thin layer of connective tissue, is a translucent membrane. Located deep in the dura, there is a potential space for the subdural space, which contains a small amount of fluid.

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The arachnoid membrane spans the brain and covers the surface of the brain. There is a large space between the pia meningeal membrane and the subomental cavity, which is filled with cerebrospinal fluid.

At certain points, the subarachnoid space expands and deepens, becoming the subarachnoid cistern. The largest is the cerebellar medulla cistern, which is communicated with the fourth ventricle through the median and anterior foramen. The chiasma is located in front of the optic chiasma.

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There are three layers of membrane outside the brain and spinal cord: 1, the dural (spinal) membrane, 2, arachnoid membrane, 3, soft brain (spinal) membrane is protective of the cerebrospinal tissue. The arachnoid membrane is a translucent layer between the hard (spinal) and soft (spinal) membranes. The outer arachnoid space is subdural space and the inner space is subarachnoid space, both of which are clinically important Spaces.

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