Innervation
All of the infrahyoid muscles are innervated by ansa cervicalis from the cervical plexus(C1-3) EXCEPT for the thyrohyoid muscle, which is innervated by only C1 fibres travelling with the Hypoglossal Nerve (CN XII).
The stylopharyngeus muscle is considered by many to be one of the strap muscles, but it is innervated by CN IX rather than the ansa cervicalis.
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