Kernohan's notch
Overview
 
Kernohan's notch is a cerebral peduncle
Cerebral peduncle
Mainly, the three common areas that give rise to the cerebral peduncles are the cortex, the spinal cord and the cerebellum. The cerebral peduncle, by most classifications, is everything in the mesencephalon except the tectum. The region includes the midbrain tegmentum, crus cerebri and pretectum...

 indentation associated with some forms of transtentorial herniation (uncal herniation). It is a secondary condition caused by a primary injury on the opposite hemisphere of the brain. Kernohan's notch is an ipsilateral condition, in that a left-sided primary lesion (in which Kernohan's notch would be on the right side) evokes motor impairment in the left side of the body and a right-sided primary injury evokes motor impairment in the right side of the body.
Quotations

I remember one day I was coming home from kindergarten Iā€”-well, I thought it was kindergarten, it turned out later I'd been working in a factory for two years... I was wondering 'cause it was always really hot and everyone was older than me, but, um, what did I know?

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I don't want to get the same looks I give people when they get on a plane holding a baby: "That's a cute baby, just keep walking, keep walking, keep going, keep going...."

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My Point... And I Do Have One. New York: Bantam Books, 1995.

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2001 Emmy Awards (4 November 2001)

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