new_n_lost
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A 45-year-old man develops a large meningioma that compresses the brain. A head CT scan demonstrates a subfalcine herniation.
This herniation would most likely damage which of the following structures?
A. Cerebellar tonsils
B. Cingulate gyrus
C. Medial temporal lobe
D. Medulla
E. Midbrain
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| Jackofknives
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Anterior cerebral artery compression, so B?
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| new_n_lost
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Anyone Else They DO Ask Neuro Anatomy U Know !!!!!!!!!!!!!!
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| indidoc1
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A??? 
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| new_n_lost
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The correct answer is B.
Brain herniation can occur either with generalized increased intracranial pressure or as a consequence of a mass lesion of the cranium. Subfalcine herniation occurs when part of one cerebral hemisphere herniates under the falx membrane, which separates the two cerebral hemispheres along the midline of the skull. The gyrus most affected is the cingulate gyrus, which runs along the medial aspect of the cerebral hemisphere, just above the corpus callosum.
The cerebellar tonsils (choice A) can herniate into the foramen magnum, in a tonsillar herniation.
The medulla (choice D) can be compressed by the herniating cerebellar tonsils, producing damage to this structure.
The medial temporal lobe (choice C) can be damaged in uncal herniation.
The midbrain (choice E) can be damaged in the course of a uncal herniation.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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