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

Overview

Overview

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