Nervous system structure
The thyrohyoid branch (also: thyrohyoid branch of ansa cervicalis, or nerve to thyrohyoid (muscle)595, 600) is a motor branch derived from the cervical plexus595, 600457, 709 formed by fibres of (the anterior ramus of600) the cervical spinal nerve 1 (C1)582457, 709 (and - according to some sources - cervical spinal nerve 2 (C2) as well457, 709) that join and travel with the hypoglossal nerve (cranial nerve XII) to reach the suprahyoid region, branching away from CN XII distal to the superior root of ansa cervicalis582709 (which is a branching other fibres of C1-C2 that had traveled with the CN XII709), near the posterior border of the hyoglossus muscle.600 The thyrohyoid branch of ansa cervicalis innervates the thyrohyoid muscle.582457, 709
References.
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