Supratrochlear nerve block
CORTEX
The nerve block was guided with an S-NERVE ultrasound machine (Sono Site, USA), an ultrahigh frequency line array probe was placed parallel to the brow arch, the probe position was adjusted, and the supraorbital notch was found on the ultrasound image (an interruption of the bony surface echo). In-plane technology was used with an interior approach, 0.1 ml/kg local anesthetic was injected at the medial side of the supraorbital notch, and local anesthetic spread along the brow arch bone cortex (Fig. Supraorbital nerve and supratrochlear nerve block