Dural Partitions

Dural partitions separate different parts of the brain. They are formed when the internal meningeal layer of the dura mater folds away from the external periosteal layer. There are several dural partitions within the cranial cavity and they include:
  • Falx cerebri
  • Tentorium cerebelli
  • Falx cerebelli
  • Diaphragma sellae


Falx cerebri

Is the largest of the dural partitions, dividing the cerebrum sagittally into its left and right hemispheres. It attaches anteriorly to the frontal crest of the frontal bone and posteriorly to the tentorium cerebelli.

Tentorium cerebelli

This partition lies tranversally and separates the cerebrum from the cerebellum. It extends from anterior and posterior clinoid processes of the sphenoid bone anteriorly, to the occipital bone posteriorly. It is attached laterally along the superior border of the petrous part of the temporal bone. The falx cerebri, at the point where it attaches to the tentorium cerebelli, pinching it and forming a free space underneath called the tentorial notch. This where the brainstem is situated.

Falx cerebelli

The falx cerebelli lies vertical, extending inferiorly from the tentodium cerebelli to the occipital crest of the occipital bone. It begins to separate the left and right hemispheres of the cerebellum.

Diaphragma sellae

This is the smallest of the dural partitions. It lies in the horizontal plane and lines the pituitary fossa in the sella turcica of the sphenoid bone. The infundibulum which connects the pituitary gland to the base of the brain pierces through the middle of the diaphragma sellae.