Why is the epidural space or subarachnoid space used instead of the subdural space?

The subdural space is only a potential space, not a continuous space suitable for puncture, and the dural and arachnoid membranes are almost glued together. The short answer is that you can only find this gap in an autopsy, but it's very difficult to penetrate it.

There is a very small chance that a tube will be inserted into the subdural space and a subdural will occur during epidural anesthesia.

What you say additionally is wrong, the main method of anaesthesia is general anaesthesia.

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