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Schwannoma of the ansa cervicalis is extremely rare and there have only been four reported cases in the literature.
They propose that both muscles are derived from the intermediate region between the subclavius muscle and the inferior belly of the omohyoid muscle, and can be innervated by the nerve to the subclavius muscle or by the branch to the omohyoid muscle arising from the ansa cervicalis.
It gave a branch to the aberrant muscle in its fleshy part and then joined with 'descendens cervicalis' to complete the ansa cervicalis which continued to supply the sternohyoid & sternothyroid.