Truncal block questions

Hi, I have a few block questions and I hope someone can help me answer them. Thanks! What is the purpose of rectus sheath blocks when you can do TAP blocks? I been told if the incision is midline, do bilateral rectus sheath blocks. But shouldn't bilateral TAP blocks cover midline as well? The midline nerves come off the main nerves blocked by TAP, and TAP is a much easier block to do since rectus is right next to the peritoneum.. I've also been doing some Erector spinae blocks for abdominal... Truncal block questions
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