It is a rotational injury caused by sudden acceleration.
• As seen in autopsy, concussion occurs when the head is free to move with sufficient velocity, but not when it is fixed. It is popularly known as ‘stunning ‘, and may be produced by direct violence on the vertex, by indirect violence as a result of a violent fall upon the feet from height, or by an unexpected fall on the ground, when pushed forcibly in any traffic accident or an injury received in industry.
• The impact on the hollow structure of skull is propagated by radiating waves of motion along with the site of impact and coverage as they approach the opposite pole giving rise at the point of collision to a contralateral or countercoup injury.
• The contusion and laceration of brain occurs due to the traction as the brain is torn away from its covering by the force of its own momentum. Application of a blow to the movable head is followed by a positive pressure in the area of brain underlying the zone of impact and by a negative pressure over the contralateral brain surface where the brain pulls away from the skull.
• The injuries of the brain heal by forming adhesions and may later cause secondary epilepsy.
(Contributed by Dr Sudhir Gupta)
• As seen in autopsy, concussion occurs when the head is free to move with sufficient velocity, but not when it is fixed. It is popularly known as ‘stunning ‘, and may be produced by direct violence on the vertex, by indirect violence as a result of a violent fall upon the feet from height, or by an unexpected fall on the ground, when pushed forcibly in any traffic accident or an injury received in industry.
• The impact on the hollow structure of skull is propagated by radiating waves of motion along with the site of impact and coverage as they approach the opposite pole giving rise at the point of collision to a contralateral or countercoup injury.
• The contusion and laceration of brain occurs due to the traction as the brain is torn away from its covering by the force of its own momentum. Application of a blow to the movable head is followed by a positive pressure in the area of brain underlying the zone of impact and by a negative pressure over the contralateral brain surface where the brain pulls away from the skull.
• The injuries of the brain heal by forming adhesions and may later cause secondary epilepsy.
(Contributed by Dr Sudhir Gupta)
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