HSC 350 Lecture Notes - Lecture 2: Tentorium Cerebelli, Epineurium, Migraine
Document Summary
The meninges (3 layers: dura mater: thickest, outermost layer, protective, impermeable. Has 2 layers which are closely united except at venous sinuses. Periosteal layer: attached to inner surface of skull continuous with periosteum (connective tissue) on outside of skull bones and sutures; not continuous with dura mater of sc. Penetrate spaced in cerebral hemispheres continuous with dura mater of sc and epineurium of cn: arachnoid mater: middle layer, impermeable, adjoins dura. Arachnoid granulations: site where csf diffuses into the venous sinuses. Once the brain is bathed in csf, waste must be filtered into the venous system: pia mater: delicate, permeable, innermost, resting on the brain surface. Arteries carry a sheath of pia as it enters the parenchyma. This fuses with ependyma to create choroid plexuses. Venous sinus: large, low-pressure blood vessel return path for cerebral venous blood. Partitions from meningeal layer: both function to restrict brain displacement associated with acceleration and deceleration. Falx cerebri: sickle-shaped fold separating the cerebral hemispheres.
