Transtentorial herniation, Uncal herniation
occurs when the medial aspect of the temporal lobe compresses the free margin of the tentorium.

1. Compress CN III → ipsilateral pupillary dilation※Note the parasynpathetic nerve of CNIII is first affected by compression, followed by motor nerve damage. 
 
2. Compress ipsilateral Posterior cerebral artery → hypoperfusion of the primary visual cortex, contralateral hemianopsia


 
3. Compress ipsilateral crus cerebri → contralateral hemiparesis
sometimes contralateral crus cerebri is compressed, causing paresis which is ipsilateral to the mass lesion(Kernohan’s notch)


 
4. Duret hemorrhages = Hemorrhagic lesions in the midbrain and pons


[X] ←helpful site to study about herniation

Transtentorial herniation, Uncal herniation

occurs when the medial aspect of the temporal lobe compresses the free margin of the tentorium.

1. Compress CN III → ipsilateral pupillary dilation
※Note the parasynpathetic nerve of CNIII is first affected by compression, followed by motor nerve damage. 

 

2. Compress ipsilateral Posterior cerebral artery → hypoperfusion of the primary visual cortex, contralateral hemianopsia

 

3. Compress ipsilateral crus cerebri → contralateral hemiparesis

sometimes contralateral crus cerebri is compressed, causing paresis which is ipsilateral to the mass lesion(Kernohan’s notch)

 

4. Duret hemorrhages = Hemorrhagic lesions in the midbrain and pons

image

[X] ←helpful site to study about herniation

(Source: flickr.com)

@11 months ago with 54 notes
#medical #neurology 
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