The falx cerebri, also known as the cerebral falx, its a dural brain covering, so named from its sickle-like form, is a strong, arched fold of dura mater that descends vertically in the longitudinal fissure between the cerebral hemispheres.

It is narrow in front, where it is attached to the crista galli of the ethmoid bone; and broad behind, where it is connected with the upper surface of the tentorium cerebelli.

Its upper margin is convex, and attached to the inner surface of the skull in the middle line, as far back as the internal occipital protuberance; it contains the superior sagittal sinus. Its lower margin is free and concave, and contains the inferior sagittal sinus.

The falx cerebri is known to calcify with age.

The falx is a more reliable guide than the anterior cerebral artery ACA in completing the posterior part of the intraventricular callosotomy ¹⁾.

see Parafalcine arteriovenous malformation.

see Falx meningioma