The investigators test with the present study design, whether an ultrasound-guided blockade of the cervical plexus in combination with an additional application of local anesthetic to the superficial cervical ansa (facial nerve: cervical branch) leads to an improved quality of anesthesia.
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Local Anesthetic Supplementation (Frequency)
Timeframe: intraoperatively
Local Anesthetic Supplementation (Volume)
Timeframe: intraoperatively