Comparison between CV4 and EV4 - Osteopathic Research

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2.2 Intra-cranial membrane system
fig. 2 meningen
Arachnoid and Pia mater (Leptomeninx)
The arachnoid, which has no vessels, is located immediately next to the dura
mater and bridges over all the wrinkles and crevasses, in contrast to the pia
mater, a layer highly supplied with blood, which closely follows all of the
brain’s convolutions and also has a nutritional function. The subarachnoidal
space which is filled with CSF is located between the arachnoid and the pia
mater.
Dura mater (Pachymeninx)
The inelastic dura mater lines the inner surface of the cranium and the spinal
channel. It consists of the outer periostal and inner meningeal layer. In specific
areas, the meningeal layer of the dura separates itself from the periostal layer
and forms a cavity for the venal sinus system.
The meningeal layers branch out to reunite and form the septum (duplicates of
the dura) which runs vertically (falx cerebri and falx cerebelli), and horizontally
(tentorium).
The falx cerebri acts as partition between the hemispheres of brain. It runs in the
shape of a crescent from the crista galli along the sagittal sinus to the internal
protuberance of the occipital bone. Its basis forms the straight sinus and
becomes the tentorium. The falx cerebelli separates the two hemispheres of the
Margit Grill / 2006