what is a concussion

Ronald Petrarca nor at gwis2.circ.gwu.edu
Sun Sep 24 12:53:21 EST 1995

     I understand that a concussion is a severe blow to the head 
resulting in a temporary change in consciousness. What exactly happens 
when one suffers a concussion? What is the difference between a 
concussion and an ordinary knock on the head? Also, is there a threshold 
below which the brain is completely shielded from mechanical disturbance? 
In other words, how well do the skull and cerebrospinal fluid protect the 

                             Ron Petrarca

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