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By J. Stirling

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The former is referred to as the skeletal nervous system and the latter is the autonomic nervous system (A S). Another way of sub~ividing the nervous system is to take into account the direction of nerve impulses conveyed along particular neurons. Afferent or sensory neurons carry nerve ilnpulses towards the brain. Efferent or motor neurons carry impulses from the brain outwards towards muscles. iates neurons with and without myelin slleaths. The sheath, (which actually only covers the axon part of the neuron), dramatically improves speed of conduction, allowing nerve impulses to be carried at over 100 metres per second.

Discriminating tones, and face recognition. e loss of language function. The split brain syndrome Forty years ago, the drugs used to control epilepsy were not as effective as those available today. For some people mewcatiollS were tmable to prevent regular epileptic seizures.. making any semblance of a normal life impossible. At the same time, scientists were beginning to realise that the seizures themselves could cause progressive damage to the brain. Seizures often seem to originate in a particular location, but then spread (rather like ink on a blotter) to affect adjacent cortical regions.

This structure is actually a massive band ofaxons running from one side of the cortex to the other. mye1inated axons! The relative isolation of the two hemispheres is best demonstrated by the observation that it is possible to insert a thin probe at any point along the longitudina1 fissure (which separates them) and the first thing you would touch is the corpus callosum about 2 to 3 cm down. 1 ). Reprinted with perm ission of Wadsworth Publish ing, a division of International Publishing. I N I mentioned earlier that the cortex itself is made up primarily of celJ bodies, and one of the largest and most prominent types of CQrticai celJ is the so-called pyramidal.

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