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Protective role of cerebrospinal fluid in brain injuries
  1. R SUNDERLAND, Consultant Paediatrician
  1. School of Manufacturing and Mechanical Engineering, University of Birmingham
  2. Birmingham B15 2TT, UK
  3. Birmingham Children's Hospital
  4. Birmingham B4 6NH, UK

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Editor,—We would like to offer a simple model of brain injury which explains many features of “closed skull” injuries—that is, those where damage results from the action of inertial forces only.

The model is easily constructed as follows. Fill a jam jar to the brim with water. Glue two threads to an egg, suspend the egg in the water, and screw the lid on tightly. If the jar is shaken horizontally as vigorously as possible, …

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