Falx cerebri

Falx cerebri is a midline sickle-shaped fold of the dura mater situated between brain’s two hemispheres. The dura mater, together with the arachnoid mater, covers the entire brain, making it difficult to observe the brain’s underlying grooves and folds. However, in certain areas, the inner/meningeal layer of the dura mater separates from the outer periosteal layer and extends into the brain. This creates folds or partitions that not only separate different brain regions but also provide structural support to the brain.

One of these dural partitions is the falx cerebri, which connects at the front to a bony ridge called the crista galli on the upper surface of the cribriform plate of ethmoid bone. Towards the back, the falx cerebri is attached to the tentorium cerebellum, which is positioned horizontally.

Several important venous sinuses can be found along the edges of the falx cerebri. These include the superior sagittal sinus along the upper edge, the inferior sagittal sinus along the lower edge, and the straight sinus where the falx cerebri and tentorium cerebellum meet at the rear.

Apart from the falx cerebri, other significant dural partitions in the brain include the falx cerebelli, the tentorium cerebelli, and the diaphragma sellae.