I am working on modifying TAP block in animal and am working on detailed steps of the block in human. Unfortunately, the few references I looked in are not really helpful?
Carrie Schroeder reported a couple of studies using cadavers:
Weight-based volume of injection influences cranial to caudal spread of local anesthetic solution in ultrasound-guided transversus abdominis plane blocks in canine cadavers.
Bruggink SM, Schroeder KM, Baker-Herman TL, Schroeder CA.
Vet Surg. 2012 May;41(4):455-7. doi: 10.1111/j.1532-950X.2012.00972.x. Epub 2012 Mar 1.
Ultrasound-guided transversus abdominis plane block in the dog: an anatomical evaluation.
Schroeder CA, Snyder LB, Tearney CC, Baker-Herman TL, Schroeder KM.
Vet Anaesth Analg. 2011 May;38(3):267-71. doi: 10.1111/j.1467-2995.2011.00612.x.