Described in 1973, the GOW-GATES mandibular block uses extra-oral landmarks. The anesthetic is deposed to the condylar neck. Gow-Gates claims that this single injection is enough for anesthesizes the sensitive branches of the mandibular nerve. The study of anatomical cuts shows that the interpterygoïd facial guides the anesthetic drug in bottom an ahead toward the mandibular foramen. That the liquid occupies all the pterygo mandibular space and that it escapes about it behind only through the Juvara slot.