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Increases in caliber as it passes posteriorly (direction of venous blood supply)

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Triangular on transverse section

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Has lateral expansions: lacunae laterals

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Cerebral veins empty here

Inferior sagittal sinus

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Joins great cerebral vein (of Galen) to form straight sinus

Straight sinus

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Runs obliquely b/w falx cerebri and tentorium cerebelli

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Empties into confluens of sinuses

Transverse sinus

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After leaving tentorium, becomes sigmoid sinus

Sigmoid sinus

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Leads to jugular foramen

Superior petrosal sinus

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Runs in attachment of tentorium cerebelli to superior margin of petrous bone

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Connects cavernous sinus w/ transverse sinus

Cavernous sinus

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Traversed by internal carotid artery, CN III, IV, VI, V1+2,

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If carotid artery ruptures within cavernous sinusarteriovenous fistula (shunt)

Abnormal reflux of blood from cavernous sinus into ophthalmic veins, which normally drain contents of orbital cavity

Eye is protruded engorged and pulsating in synchrony with radial pulse (pulsating exophthalmos)

Vessels/nerves/structures of importance during removal of brain

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Vertebral artery: enters via foramen magnum

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Trochlear nerve (IV): most delicate; caudal to colliculi of midbrain

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Trigeminal nerve (V): largest CN, emerges from brain stem

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Facial nerve (VII) and vestibulocochlear nerve (VIII): exits via internal acoustic meatus

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Glossopharyngeal nerve (IX), vagus nerve (X) and accessory nerve: jugular foramen

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Infundibulum: stalk of pituitary

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Abducent nerve (VI) pierces dura within posterior cranial fossa

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Middle meningeal vessels: embedded in outer layer of dura materforamen spinosum

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Greater petrosal nerve

Small branch of facial nerve

Carries important parasympathetic fibers to pterygopalatine ganglion

Lies extradurally

Travels to foramen lacerum and then to pterygoid canal

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Lesser petrosal nerve

Parasymp fibers to otic ganglion

Lateral to greater petrosal nerve to foramen ovale

Folds of dura mater

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Tentorium cerebelli

Separates cerebellar lobe from occipital pole of cerebral hemisphere

Supports weight of occipital poles

Encloses transverse sinuses

Anterior and medial borders are free and form tentorial notch that surrounds midbrain

Attached to petrous portion of temporal bone

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Falx cerebelli

Sickle shaped

Anterior free border projects between cerebellar hemispheres in median plane

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Falx cerebri

Large, sickle-shaped membrane

Lies b/w two cerebellar hemispheres

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