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A D V E R T I S E M E N T
A D V E R T I S E M E N T
The middle meningeal artery ascends from the foramen spinosum within the outer layer of the dura and supplies dura and skull. It is supplemented by branches of the occipital, vertebral and internal carotid arteries.
A D V E R T I S E M E N T
After entering the skull, the carotid arteries follow a serpentine course through the petrous portion of the temporal bone into the layers of dura forming the cavernous sinus. The petrous portion lies between the tympanic cavity and the semilunar ganglion. The cavernous portion is in close association with cranial nerves III, IV, V and VI and supplies branches to the surrounding structures including the pituitary. The carotids loop up out of the cavernous sinuses and penetrate the dura just medial to the anterior clinoid processes, where they give off the ophthalmic arteries. The cavernous and intracerebral portion of carotid is called the carotid siphon.
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A D V E R T I S E M E N T
The cerebral portion of the internal carotids then are joined by the posterior communicating branches and give off the anterior choroidal arteries. The latter enter the choroid plexus of the lateral ventricles at the inferior horns and supply the deep temporal lobes, midbrain, optic tracts, optic radiations, basal ganglia and internal capsule. The internal carotids then divide into anterior and middle cerebral arteries. The anterior cerebrals are joined by the anterior communicating artery.
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This page was last modified on 7/20/1999.
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