[4] The falx cerebri is a strong, crescent-shaped sheet of dura mater lying in the sagittal plane between the two cerebral hemispheres.

[3] The falx cerebri attaches anteriorly at the crista galli (proximally to the cribriform plate and to the frontal and ethmoid sinuses).

[2] Lymphatic drainage of the falx cerebri occurs mostly via meningeal lymphatic vessels that run parallel to the dural sinuses and that eventually exit the cranial vault through the jugular foramen to empty into deep cervical lymph nodes.

A minority of lymph from the falx cerebri is drained anteriorly through the cribiform plate into the lymphatics of the nasal mucosa.

[3] The corpus callosum lies immediately inferior to the lower (free) margin of falx cerebri.

[3] Total or partial agenesis of the falx cerebri may occur, and may result in adherence of the cerebral hemispheres across the midline.

[6] The falx cerebri is a significant surgical landmark for access of the lateral ventricles via the interhemispheric transcallosal approach; agenesis (complete or partial) of the falx cerebri results in the adherence of the cerebral hemispheres, blocking midline transcallosal surgical access to the ventricles.