Why is the anesthesia needle either the epidural space or the subarachnoid space instead of the subdural space?

The subdural space is just a potential space, not a continuous space suitable for puncture, and the dura and arachnoid are almost glued together. Simply put, you can only find this gap in anatomy, but it is difficult to puncture this position.

During epidural anesthesia, there is a small possibility that a tube will be inserted into the subdural space, and subdural anesthesia will occur.

In addition, your statement is wrong, the main method of anesthesia is general anesthesia.

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