Thyrohyoid branch

The thyrohyoid branch (also: thyrohyoid branch of ansa cervicalis, or nerve to thyrohyoid (muscle)^{: 595, 600}) is a motor branch derived from the cervical plexus^{: 595, 600 : 457, 709} formed by fibres of (the anterior ramus of^: 600) the cervical spinal nerve 1 (C1)^{: 582 : 457, 709} (and - according to some sources - cervical spinal nerve 2 (C2) as well^{: 457, 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 cervicalis^{: 582 : 709} (which is a branching other fibres of C1-C2 that had traveled with the CN XII^: 709), near the posterior border of the hyoglossus muscle.^: 600 The thyrohyoid branch of ansa cervicalis innervates the thyrohyoid muscle.^{: 582 : 457, 709}