sturge_weber
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can someone explain an uncal herniation?????
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| sturge_weber
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| msyamp
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hernia tion of the uncus ofthe parahppocampal gyrus of the medial temporal lobe across the tentorium cerebelli. causess 3rd nerve palsy and posterior ciclation defects. due to tumour in supratentorium
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| msyamp
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hey you and me posted the same time. nice pic though
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| sturge_weber
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ya got it thanks msyamp...
now can u explain subfalcine herniation...
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| msyamp
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subfalcine iswhen cerebral hemisphere is pushed to the other side of the falx cerebri
presents with headache vomitimg. and anterior cerebral artery compression that is leg paresis on either side. urinary incontinence,frontal olbe signs etc
tonsillar herniation --cerebellar tonsil from formen magnum. cause ICT. symptoms -- lhermitte phenomenon
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| sturge_weber
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ok a last q, in arnold chiari malformation type 2, do we have a tonsillar herniation
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| msyamp
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yes we have tonsillar herniation in both
In the Chiari type 1 malformation, the cerebellar tonsils protrude through the foramen magnum and into the cervical spinal canal; when this abnormality is associated with protrusion of meninges (meningocele) or meninges and cord (meningomyelocele) through a spinal canal that has incompletely closed, it is designated a Chiari type 2 (or Arnold-Chiari) malformat
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| goljan_fan
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uncal hern---
oculomotor (CNN III) paresis Ipsilateral pupil dilatation occurs as the parasympathetic fibers, which are located around the outer aspect of the third nerve, are compressed by the uncus. This leads to dysfunction of the parasympathetic fibers with subsequent unopposed sympathetic responds. This will dilate the ipsilateral pupil.
Contralateral hemiparesis occurs with compression of the ipsilateral cerebral peduncle. Since the cortical spinal tracts decussate (cross over) below the mid brain in the level of pons, the hemiparesis is contralateral.
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| anjushree
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if u have tumor on left side ------left occulomotor nerve is stretched -----dilated pupil on left side
left posterior cerebral artery is compressed----hemianopia on rt side
but rt crus cerebri is damaged (kernoham notct )-------left hemiparesis
KERNOHAN NOTCH GIVE A FALSE LOCALISING SIGN
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