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The hyoid arch forms the jaw supports; the upper portion of the hyoid arch forms the hyomandibula (which eventually becomes the stapes), and the lower segments of the hyoid arch form the hyoid apparatus.
The hyoid arch musculature was originally innervated by the post-trematic branch of the facial nerve (cranial nerve VII, the hyomandibular nerve).
When fish came onto land, the role of the hyoid arch and the facial nerve changed.