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Subarachnoid Spaces/Cisterns
Anne G. Osborn, MD, FACR; Bronwyn E. Hamilton, MD
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TERMINOLOGY

  • Abbreviations

    • Subarachnoid spaces (SASs)
  • Definitions

    • SASs: Cerebrospinal fluid-filled spaces between pia, arachnoid; expand at base of brain, around brainstem, tentorial incisura
    • Liliequist membrane: Thin arachnoid membrane separates suprasellar, interpeduncular, and prepontine cisterns
    • Velum interpositum: Double layer of pia (tela choroidea), result of folding of brain where hemispheres overgrow diencephalon, forms velum interpositum, which may remain open and communicate posteriorly with quadrigeminal cistern (cavum veli interpositi)
    • Choroidal fissure: Narrow, pial-lined channel between SAS and ventricles; site of attachment of choroid plexus in lateral ventricles

GROSS ANATOMY

  • Overview

    IMAGING ANATOMY

    • Overview

      • Internal Contents

        Related Anatomy
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        Related Differential Diagnoses
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        References
        Tables

        Tables

        TERMINOLOGY

        • Abbreviations

          • Subarachnoid spaces (SASs)
        • Definitions

          • SASs: Cerebrospinal fluid-filled spaces between pia, arachnoid; expand at base of brain, around brainstem, tentorial incisura
          • Liliequist membrane: Thin arachnoid membrane separates suprasellar, interpeduncular, and prepontine cisterns
          • Velum interpositum: Double layer of pia (tela choroidea), result of folding of brain where hemispheres overgrow diencephalon, forms velum interpositum, which may remain open and communicate posteriorly with quadrigeminal cistern (cavum veli interpositi)
          • Choroidal fissure: Narrow, pial-lined channel between SAS and ventricles; site of attachment of choroid plexus in lateral ventricles

        GROSS ANATOMY

        • Overview

          IMAGING ANATOMY

          • Overview

            • Internal Contents