According to Brisbane Insects and Spiders, the grasshopper mouth is a simple-type mouth, which has evolved with parts that function in chewing, cutting, grinding, manipulating, touching, tasting, sensing temperature and keeping food inside the mouth. The grasshopper mouth has some of the most primitive oral structures of any insect.
While the labrum is similar to an upper lip, the labium is similar to a lower lip. The mandibles cut and grind the grasshopper's food, and the maxillae behind the mandlibles are used to manipulate the food. The maxilary palpus and the labial palpus serve to touch, taste and sense temperature differences.