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One winner would get free takoyaki or milktea of their choicefrom any of the stalls that’s walking distance (ang init ngpanahon guys wag masyadong malayo pls HAHAHAHA)A. DURA MATER[Juangco]Outermost, hardest and toughest layerConsists of two layers of tough, fibrous connective tissue®Outer layer –periostealorendosteallayer,closelyadherent to the bone®Inner layer – actualmeningeallayer§Forms the outer limit of the very narrow subdural space[Baehr & Frotscher]The two dural layers separate from each other at the sites ofthe dural sinuses[Baehr & Frotscher]Compartments®Epidural space[Gould]§Potential space between the dura mater and bones ofthe cranial vault®Subdural space[Gould]§Potential space between the dura mater and arachnoidProjections of the Dura[Juangco] [Baehr & Frotscher]Falx Cerebri®Falx– double fold of dura mater®Between the superior and inferior sagittal sinuses®Lies in the midsagittal plane between the two cerebralhemispheresFalx Cerebelli®Separates the two cerebellar hemispheresTentorium Cerebelli®Continuous with the falx cerebri®Separates the cerebellum from the cerebrumDiaphragma Sellae®Separates the pituitary gland from the hypothalamus®Forms the roof for the sella turcica[Snell]Figure 21.Projections of the duraTentorial notch[Juangco]®Opening in the anterior edge of tentorium cerebelli forpassage of the brainstemBlood Supply to the Dura[Juangco] [Baehr & Frotscher]Middle Meningeal Artery®Largest®Branches are distributed over the entire lateral convexity ofthe skull®Branch of the maxillary artery which is derived from theexternal carotid artery®Enters the skull through theforamen spinosumAnterior Meningeal Artery®Relatively small®Supplies the midportion of the frontal dura mater and theanterior portion of the falx cerebri®Branch of the anterior ethmoidal artery,which is a branch oftheophthalmic artery§It therefore carries blood from theinternal carotid artery®Enters the skull through the anterior portion of thecribriform platePosterior Meningeal Artery®Supplies the dura mater of the posterior cranial fossa®Branch of the occipital artery and the vertebral artery®Enters the skull through thejugular foramenFigure 22.Arterial supply of the duraDural Innervation[Juangco]Table 3.Dural innervationAbove the TentoriumInfratentorial PortionBranches of thetrigeminalnerveBranches of theuppercervicalsegmental nervesand thevagusThe brain is not pain-sensitive, but the dura is a pain-sensitivestructureAfferent fibers accompanying the meningeal arteries areparticularly sensitive to pain[Baehr & Frotscher]B. ARACHNOID[Baehr & Frotscher]Thin, delicate, avascular membrane closely applied to the innersurface of the dura materArachnoid granulations– absorb CSF[Juangco]Subarachnoid Space[Baehr & Frotscher]Between the arachnoid and pia materContains the cerebrospinal fluidWhere blood vessels are found[Juangco]Arachnoid and pia mater are connected to each other acrossthis space by delicate strands of connective tissue

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