Which muscle is innervated by C1 fibers traveling with the hypoglossal nerve to elevate the hyoid?

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C1 fibers that travel with the hypoglossal nerve specifically innervate the geniohyoid. This muscle runs from the mental spine of the mandible to the hyoid, and when it contracts it elevates the hyoid and draws it forward, aiding swallowing. The other muscles listed have different innervation and actions: the mylohyoid is innervated by the nerve to the mylohyoid (a branch of V3) and helps lift the floor of the mouth and the hyoid; the omohyoid and sternohyoid are innervated by the ansa cervicalis and generally depress the hyoid. Therefore, the muscle that fits the description of being innervated by C1 fibers traveling with the hypoglossal nerve to elevate the hyoid is geniohyoid.