Fig. 4From: Transmuscular quadratus lumborum (TQL) block for laparoscopic colorectal surgery: study protocol for a double-blind, prospective randomized placebo-controlled trialUS-guided anatomy of the TQL. Alignment and ultrasound image of the TQL using 3 steps identifying first abdominal wall muscles anterior then sliding to posterior “shamrock” sign and movement of pre- and pararenal fatBack to article page