phase-contrast microscopy of 2.5 micron plastic sections reveals five different kinds of sense organs on the internal mouthparts of drosophila melanogaster : a ventral group of sensilla on the epipharynx , three kinds of sense organs in the middle part of the sucking apparatus ( the cibarium ) , one of them being described here for the first time , and an additional type of sensillum in the dorsal pharynx ( fig . 1 ) .
C0027442
epipharynx
C0031354
pharynx