superior root of ansa cervicalis

su·pe·ri·or root of ansa cervicalis

[TA] the fibers that arise from the first and second cervical nerves, accompany the hypoglossal nerve, then branch off to meet the inferior root in the ansa cervicalis; they innervate the infrahyoid muscles. Synonym(s): radix superior ansae cervicalis [TA], superior limb of ansa cervicalis ☆ , descendens hypoglossi, descending branch of hypoglossal nerve