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Subarachnoid Spaces/Cisterns
Bronwyn E. Hamilton, MD
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Terminology

  • Abbreviations

    • SASs: Subarachnoid spaces
  • 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 & prepontine cisterns
    • Velum interpositum: Double layer of pia (tela choroidea), the result of folding of brain where hemispheres overgrow diencephalon, forms velum interpositum which may remain open & communicate posteriorly with quadrigeminal cistern (cavum veli interpositi)
    • Choroidal fissure: Narrow, pial-lined channel between SAS & 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

          • SASs: Subarachnoid spaces
        • 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 & prepontine cisterns
          • Velum interpositum: Double layer of pia (tela choroidea), the result of folding of brain where hemispheres overgrow diencephalon, forms velum interpositum which may remain open & communicate posteriorly with quadrigeminal cistern (cavum veli interpositi)
          • Choroidal fissure: Narrow, pial-lined channel between SAS & ventricles; site of attachment of choroid plexus in lateral ventricles

        Gross Anatomy

        • Overview

          Imaging Anatomy

          • Overview

            • Internal Contents