“…The pediatric anesthesia subspecialty has made large leaps in understanding pediatric pain and stress responses during the same decades that the regional and acute pain subspecialty has benefitted from significant advances in technique and technology. Importantly, debate continues surrounding the possibility of anesthetic-induced neurotoxicity on the developing human brain, 4,[6][7][8][9][10][11][12][13][14] making techniques that can help to minimize or reduce systemic sedation in pediatric patients appealing. Regional anesthesia (RA) has evolved from a field centered around intimate anatomic mastery requiring the correlation of surface landmarks to structures beneath to a practice in which we can use technology to literally see the structures that lie under the skin and provide tailored, precise regional analgesia and anesthesia.…”