Drosophila component hypopharyngeal sense organ larval pharyngeal sense organ Multiply innervated sensillum, composed of an anterior and a posterior sensillum, located on the floor of the larval pharynx. It is innervated by 3 or 4 neurons whose axons join an anteriorly directed bundle that joins the labral nerve. Tomasz Adamusiak PPS Organ X hpo X-organ of Keilin posterior pharyngeal sensilla FBbt:00002665