Identify and explain the significance of the intraoral and extraoral landmarks for a Gow-Gates nerve block in relationship to the penetration site, needle pathway, and deposition site

What will be an ideal response?

There are two key landmarks to observe when performing a Gow-Gates nerve block. Intraorally, the height or most occlusal aspect of the mesiolingual cusp of the second molar will identify the penetration site. Extraorally, a line visualized from the intertragic notch to the labial commissure will establish the angle of the syringe barrel for penetration and provide the upward orientation angle for the syringe and needle pathway. Use of these landmarks assists in correctly locating the deposition site at the anterolateral surface of the neck of the condyle.