How many levels does epidural anesthesia go through?

Skin-supraspinal ligament-intervertebral ligament-ligamentum flavum-epidural space

The skin is usually broken open with a thicker needle, so there is no sense of breakthrough;

When the needle encounters resistance, it means that it has reached the supra-spine ligament (provided that you have inserted the needle correctly and is facing the supra-spine ligament). Pass through the supra-spine ligament. At this time, the needle will generally be fixed, that is, we often Said "pin"

There is generally no abnormal feeling when passing through the interspine ligament;

When you encounter resistance again, it means that you have reached the ligamentum flavum (of course, there may be no resistance when passing through the ligamentum flavum), and there will be an obvious feeling of loss after passing, indicating that you have reached the epidural space.

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