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by Anonymous on April 10th, 2007

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WHY DO WE HAVE CONTRALATERALISM?

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Answers. 2 helpful answers below.

  • by ChrisDG on April 10th, 2007

    ChrisDG

    If you mean with regard to ascending/descending neural tracts, nobody knows the real answer. It's possible it allows a greater level of control, such as in movement, where various system modulate the primary impulses from just "reaching out for cup" to "reaching out for the cup, without reaching out to fast and too far, which results in the cup being knocked over, and not reaching out too slowly, and to maintain a smooth movement to conserve energy and allow for a greater degree of control during the movement".

    Furthermore, different systems cross over at different levels. So, although some sensory inputs cross over at one spinal level, the motor movements for the muscles cross over at a different level. This is illustrated in such conditions such as Brown-Sequard syndrome, whereby a lesion on one side of the spinal cord will produce problems with the sensation of temperatrure on one side of the body but cause motor problems on the opposite side, because the fibres from one tract have crossed over to the other side, whilst the other tract cross over higher up.

    There are several theories, but no-one is entirely sure of the need for it.

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  • by caramels_mum on April 10th, 2007

    caramels_mum

    did,nt know i had it am i dying

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