Transversus abdominis plane (TAP) block refers to the infiltration of local anesthetics into the fascial plane between the internal oblique and transversus abdominis muscles (Oh et al., 2017).​  

Oh, T., Kim, J., Eom, W., Lee, S., Kim, D., Yim, J., . . . Kim, D.H. (2017). Effects of preoperative ultrasound-guided transversus abdominis plane block on pain after laparoscopic surgery for colorectal cancer: A double-blind randomized controlled trial. Surgical Endoscopy, 31, 127–134. https://doi.org/10.1007/s00464-016-4941-7