Chapter 9 discusses truncal peripheral nerve blocks, which are utilized for supplemental analgesia for abdominal surgeries by providing local anesthesia to the anterior abdominal wall. These blocks are adjuvants because they will not block visceral pain. Unilateral analgesia to the skin, muscles, and parietal peritoneum of the abdominal wall is achieved. The transversus abdominis plane block (TAP) reliably provides analgesia to the lower abdominal wall in the T10–L1 distribution. Rectus sheath blocks anesthetize the terminal branches of the lower thoracic intercostal nerves and provide midline analgesia from the xiphoid process to the umbilicus. Surgical indications for TAP blocks include laparotomies, laparoscopies, inguinal hernia repairs, and appendectomies. Rectus sheath block indications include midline surgeries such as single-port appendectomies and umbilical hernia repairs.