BRUDZINSKI'S AND KERNIG'S SIGNS

What do Brudzinski's and Kernig's signs imply? Both signs are significant
for brain insult such as:Meningitis and SAH ( Subarachnoid Hemorrhage ). 
  
Brudzinski's and Kernig's signs are seen in patients who have Meningitis or 

Brudzinski's sign -When the examiner flexes the patient's neck, the knees and 
hips flex at the same time.
Kernig's sign - inability to straighten the leg when the hip is flexed at a 90 degree
angle. The hamstring muscles become very stiff.

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