QS Study

Cerebral dura mater refers to the membranous coverings of the brain and spinal cord. It is composed of 2 layers: outer bargain and inner meningeal layers and is a powerful fibrous membrane. With the exception of where they enclose venous sinuses, the 2 layers are fused with each other.

Folds of cerebral dura mater:

(a) Falx cerebri.

It’s a large sickle-shaped fold of the dura mater inhabiting the median longitudinal fissure between the 2 cerebral hemispheres. Its convex upper margin is connected to the lips of the sagittal sulcus of the skull vault and its lower concave margin is free and is located just above the corpus callosum.

  • The superior sagittal sinus runs in its upper fixed margin.
  • The inferior sagittal sinus runs in its lower concave free margin.
  • The straight sinus runs along its attachment to the tentorium cerebella.

Folds of Cerebral Dura Mater 1

Fig: Folds of Cerebral Dura Mater

(b) Tentorium cerebelli.

The inner free margin is U shaped and encloses the tentorial notch for the passage of the midbrain. The anterior ends of the concave free margin are connected to the anterior clinoid processes. The outer connected margin is convex and connected on every side to the posterior clinoid process, the posteroinferior angle of the parietal bone and the lips of transverse sulci on the occipital bone.

(c) Falx cerebelli.

It’s a small sickle-shaped fold of the dura mater in the sagittal plane projecting forwards into the posterior cerebellar notch. It goes from the internal occipital protuberance along the internal occipital crest to the posterior margin of the foramen magnum.

(d) Diaphragma sellae.

It’s connected anteriorly to the tuberculum sellae and posteriorly to the dorsum sellae and becomes constant on every side together with the dura mater of the middle cranial fossa. It’s a central aperture which gives passage to the stalk of the pituitary gland.

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