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Anteriorly, attached t crista galli of ethmoid bone

Triangular plate projecting into interior of skull

Cribriform plate: plate on either side of crista galli

o

Numerous foramina for filaments of olfactory nerve

Posteriorly, fused with tentorium cerebelli

Superior border: superior sagittal sinus

Inferior border: inferior sagittal sinus

Gross Anatomy of Brain

o

Lateral sulcus (lateral cerebral fissure; fissure of Sylvius)

b/w temporal lobe, frontal lobe and parietal lobe

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Central sulcus (fissure of Rolando)

b/w frontal lobe and parietal lobe

Circle of Willis

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Two vertebral and two internal carotid arteries supply brain

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Arteries join to form Circle of Willis

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Right and left posterior inferior cerebellar arteries arise from respective vertebral arteries

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Right and left vertebral arteries join to form basilar artery

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Basilar artery gives off anterior inferior cerebellar arteries, superior cerebellar arteries and posterior cerebral arteries

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Oculomotor nerve emerges b/w posterior cerebral artery and superior cerebellar artery

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After giving off ophthalmic artery, internal carotid artery terminates by dividing into middle cerebral artery and anterior cerebral artery

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Arterial circle

Basilar artery 2 posterior cerebral arteries2 posterior communicating arteries2 internal carotid arteries2 anterior cerebral arteriesanterior communicating artery

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Middle cerebral arterylateral sulcus

Supplies insula, superolateral surface of cerebral hemisphere

Supplies corpus striatum and internal capsulearteries of cerebral apoplexy (stroke)

Cranial Fossae

Anterior Cranial Fossa

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Separated from middle fossa by three concave crests: 2 lesser wings of sphenoid bone and anterior margin of optic (chiasmatic) groove

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Bones of anterior cranial fossa: sphenoid bone, crista galli and cribriform of ethmoid bone and orbital plates of frontal bone (roof of orbital cavities)

Posterior Cranial fossa

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Largest and deepest of three fossae

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Separated from middle fossa by dorsum sellae and superior borders of right and left petrous bones

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Dominated by foramen magnum

At level of foramen, medulla oblongata is continuous w/ spinal cord

Inclining bony surface anterior to foramen: clivus

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Path of trigeminal nerve

Curves superior to most medial part of superior margin of petrous bone

Passes inferior to attached margin of tentorium into middle cranial fossa to enter the trigeminal cave

Middle Cranial Fossa

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Composed of sphenoid bone and temporal bone

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Occupied by temporal poles and lobes of cerebral hemisphere

Foramina

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Superior orbital fissure: CN III, IV, V1, VI, sympathetic nerve fibers and superior ophthalmic vein

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Foramen rotundum: CN V2

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Foramen ovale: CN V3, lesser petrosal nerve

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