Falx cerebri

The falx cerebri is the largest of the four main folds (or septa) of the intracranial dura mater, separating the cerebral hemispheres 1

The falx cerebri is a double-fold of dura mater that descends through the interhemispheric fissure in the midline of the brain to separate the cerebral hemispheres.

The falx cerebri is relatively thin anteriorly where it attaches to the crista galli of the ethmoid bone, but is broader posteriorly where it attaches to the superior surface of the tentorium cerebelli inferiorly 1-2. It attaches superiorly to the midline of the cranium and extends posteriorly to attach to the the internal occipital protuberance 3.

For blood supply and innervation, see dura.

  • anterior midline linear density near the vertex
  • triangular density inferiorly and posteriorly on axial sections 4
  • partially calcified in 7% of individuals
  • thin membrane on T1W and T2W images 
  • calcifications visible on T1W imaging as hyperintensities and hypointensities on T2W imaging 5

The word originates from the latin falx meaning sickle, due to it's sickle-like shape.

Anatomy: Brain
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Article information

rID: 25195
Section: Anatomy
Synonyms or Alternate Spellings:
  • Falx

Cases and figures

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    Figure 1: falx cerebri
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    Case 1
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Images ...
    Figure 2: falx cerebri as a dural fold
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