Glossopharyngeal Nerve Block for Post -Tonsillectomy Pain Relief

a linear high frequency ultrasound probe will be initially positioned over the hyoid bone in the transverse plane, then the probe will be rotated to keep in line with the mandibular angle and the pharyngeal wall is identified by US. Using an in plane approach, a 22 G ,5 cm needle will be advanced till it reaches just superficial to the pharyngeal wall and 2.2 ml of 0.25% bupivacaine will be injected.