Why is anesthesia either epidural or subarachnoid instead of subdural?

The subdural space exists in theory and anatomy, but it is quite difficult to operate in practice, and it is clinically meaningless. The principle of anesthesia, the amount of anesthetics and the effect of anesthesia in the subdural space are the same as those in the subarachnoid space. Moreover, the puncture technique of the subdural space is almost impossible to accomplish clinically, and it is quite dangerous. Therefore, there is no clinical subdural anesthesia.

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