The sensory nerve above the vocal cords is a branch of which nerve?

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Understanding how the larynx is innervated helps here: the sensory supply above the vocal cords comes from the internal branch of the superior laryngeal nerve. This branch is purely sensory and enters the larynx through the thyrohyoid membrane to provide sensation to the laryngeal inlet, including the epiglottis and nearby mucosa. The superior laryngeal nerve itself is a branch of the vagus nerve, but the specific sensory pathway above the cords is carried by its internal (sensory) branch, not by the recurrent laryngeal nerve, which handles sensation below the cords (and most intrinsic motor functions). Glossopharyngeal contributes to other areas of the oropharynx and is not the primary source for laryngeal sensation above the cords.