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9 Cards in this Set

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What are the 4 types of herniation?
1. Subfalcine (cingulate) herniation
2. Central herniation
3. Uncal herniation
4. Cerebellar herniation
Cingulate hernitation: describe
hemishpere gets pushed under the falx cerebri
Cingulate hernitation: what can it compress
anterior cerebral artery
Central downard herniation: describe
brain moves centrally either up or down across the tentorium (also called a transtentorial herniation)
Uncal hernitation: describe
central part of the temporal lobe called the uncus gets squeezed so much that it puts pressure on the midbrain
Cerebellar herniation: describe
cerebellar tonsils get squeezed through the foramen magnum
What happens if the brain stem is compressed by any of these herniations?
Coma and death
What are the symptoms of an uncal herniation and why do they happen?
1. Ipsilateral CNIII palsy
2. Contralateral homonymous heminopsia - compression of the ipsilateral post cerebral artery
3. Ipsilateral paresis - compression of contralateral crus cerebri (Kernhan's notch)
4. Duret hemorrhage - rupture of the small parenchymal vessels leads to compression of brain stem
Which of the uncal herniation symptoms is a false localizing sign?
Ipsilateral paresis