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Brainstem discovered as important relay site after stroke
Date:2/25/2014

Around 16,000 people in Switzerland suffer a stroke every year. Often the result of a sudden occlusion of a vessel supplying the brain, it is the most frequent live-threatening neurological disorder. In most cases, it has far-reaching consequences for survivors. Often the stroke sufferers have to cope with handicaps and rehabilitation is a long process. The brain does, however, have a "considerable capacity for regeneration" explains Lukas Bachmann from the Brain Research Institute of the University of Zurich. As member of Professor Martin Schwab's research team, he found that the brainstem, the oldest region in the brain, could play an important role in recovery. The results have now been published in "The Journal of Neuroscience".

The healthy half of the brain assumes control

A stroke in the cerebral cortex frequently leads to motor constraints of one half of the body, to what is known as hemiparesis. This is due to the loss of neuron pathways which transmit signals from the cortex to the spinal cord. As these pathways are crossed, the side of the body contralateral to the affected half of the brain is affected. The major impairments at the beginning are often only temporary and stroke sufferers can sometimes stage an amazing recovery. "The side of the body affected is increasingly controlled by the ipsilateral side of the cortex, i.e. the healthy side", explains Lukas Bachmann. As the neuron pathways are crossed, this raised the following question for the neuroscientists: by which pathway are the signals rerouted from the motor cortex to the ipsilateral parts of the spinal cord?

Sprouting of neurons from the brainstem

In their study in mice the researchers in Martin Schwab's team now demonstrate that the brainstem probably plays a key role in the rerouting of neural impulses. Images of the brain show that after a major stroke nerve fibers from specific core regions of the brain sprout into the area
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Contact: Dr. Lukas C. Bachmann
bachmann@hifo.uzh.ch
41-446-353-261
University of Zurich
Source:Eurekalert

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