The falx cerebelli is a small sickle-shaped fold of dura that projects forward between the two cerebellar hemispheres. It hangs below the tentorium cerebelli along the internal occipital crest and contains the occipital sinus in its attached edge.
| Location | Posterior cranial fossa, midline, attached to the internal occipital crest, from the underside of the tentorium down toward the foramen magnum |
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| Blood Supply | Meningeal branches of the occipital and vertebral arteries; Posterior meningeal artery |
Partly separates the two cerebellar hemispheres and limits side-to-side movement of the cerebellum.
The falx cerebelli is a landmark in midline suboccipital approaches to the posterior fossa. A large occipital sinus within it can bleed during surgery. Rarely, meningiomas arise from it, and duplicated or absent falx cerebelli is described as a normal variant.
A rare meningioma arising from the falx cerebelli and compressing the cerebellum, causing headache and ataxia.
Haemorrhage from the sinus in the falx cerebelli during midline posterior fossa approaches, especially in children where it may be large.
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