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
brain?
Ron Petrarca
