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Head injury

QUESTION: Why do we become unconscious when hit on the head?

Radhika Sairam, Bangalore

ANSWER: The brain is made up of millions of delicate nerve cells suspended in a clear cerebro-spinal fluid which acts as a partial shock absorber, encased inside the skull. It controls all our activities.

When the head is injured in an accident the brain absorbs the force and all results in a total black out and the person loses consciousness.

On regaining consciousness the person will appear to be dazed and confused. This condition is temporary and termed as `concussion'.

However on receiving the blow the thick muscular flap covering the entire brain substance termed `dura' starts to bleed or swell, then the person may become unconscious as it compresses the brain.

This depends on the impact of the hit and the extent of the damage caused to the brain.

This condition is termed as `insuceession'. Noted symptoms of insuceession are: blurred vision, headache and pain in the neck region, frequent giddiness, vomiting and loss of consciousness.

R. Subramanian, Trichy

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