Subarachnoid Space

In the central nervous system, the subarachnoid cavity (subarachnoid space) is the interval between the arachnoid membrane and pia mater.

It is occupied by spongy tissue consisting of trabeculae (delicate connective tissue filaments that extend from the arachnoid mater and blend into the pia mater) and intercommunicating channels in which the cerebrospinal fluid is contained.

This cavity is small on the surface of the hemispheres of the brain. On the summit of each gyrus the pia mater and the arachnoid are in close contact, but in the sulci between the gyri, triangular spaces are left, in which the subarachnoid trabecular tissue is found. Whilst the pia mater closely follows the surface of the brain and dips into the sulci, the arachnoid bridges across them from gyrus to gyrus.

At certain parts of the base of the brain, the arachnoid is separated from the pia mater by wide intervals, which communicate freely with each other and are named subarachnoid cisternæ; in these the subarachnoid tissue is less abundant. The subarachnoid space is the location of the interface between the vascular tissue and the cerebrospinal fluid and is active in the blood brain barrier.

The arachnoid mater continues down the spinal cord too, and the subarachnoid layer with it. It serves a similar function in the spinal cord as it does in the brain.

Other articles related to "subarachnoid space, space":

Walter Dandy - Scientific and Clinical Contributions - Contributions To Neuroradiology
... To accomplish this, CSF in the ventricles and subarachnoid space was replaced with air injected either directly into the ventricles (ventriculography) or ... In this procedure, air was injected into the subarachnoid space of the lumbar spinal canal and then the air bolus was maneuvered into the subarachnoid space around the brain and ...
Neoplastic Meningitis - Causes - Infiltration To Spinal Cord
... Infiltration from the subarachnoid space into the spinal cord occurs primarily along the perivascular tissues that surround blood vessels at the brain entrance ... tumor cells are found diffusely in the subarachnoid space from the cervical to sacral levels ... Infiltration from the subarachnoid space into the spinal cord occurs mainly along the perivascular space of the white matter ...
Meningitis - Mechanism
... The subarachnoid space separates the arachnoid and pia mater membranes and is filled with cerebrospinal fluid ... bacteria have entered the bloodstream, they enter the subarachnoid space in places where the blood–brain barrier is vulnerable—such as the choroid plexus ... or the nasal sinuses that have formed a tract with the subarachnoid space (see above) occasionally, congenital defects of the dura mater can be identified ...

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