Where is the epidural anesthesia?

It happens that I am studying anesthesia. Epidural anesthesia refers to epidural anesthesia. It is divided into posterior median puncture and paramedian puncture. It is usually penetrated from the space of 2~3 lumbar spinous processes, as well as sacral hiatus. After passing through the ligamentum flavum, there will be an obvious sense of breakthrough, and the negative pressure in the needle tube will disappear. The so-called puncture means that it has passed through the dura mater, entered the subdural space, and even passed through the arachnoid and entered the subarachnoid space, causing the cerebrospinal fluid to flow out.

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