Definitions for subarachnoid space

This page provides all possible meanings and translations of the word subarachnoid space

Princeton's WordNet

  1. subarachnoid space(noun)

    a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid

Wiktionary

  1. subarachnoid space(Noun)

    The space between the arachnoid mater and the pia mater that surround the brain and spinal cord.

Freebase

  1. Subarachnoid space

    In the central nervous system, the subarachnoid cavity is the interval between the arachnoid membrane and pia mater. It is occupied by spongy tissue consisting of trabeculae 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.


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