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The external branch of the anterior ethmoidal nerve supplies the tip; it is blocked at the caudal edge of the nasal bone by an internal or external approach.
The pledgets are removed after 10 minutes, and 1% lidocaine with 1:100,000 epinephrine is injected at the axilla of the middle turbinate to block the anterior ethmoidal nerve, which supplies the anterior septum and mucosa around the nasofrontal recess.
NMDA and GABAA receptors in the rat Kolliker-Fuse area control cardiorespiratory responses evoked by trigeminal ethmoidal nerve stimulation.