Collective term for the gustatory organs of the head, including the labrum, paired mandibles, paired maxillae, and labium.

The appendages of the head used for feeding, including the labrum, hypopharynx, mandibles, maxillae, and labium.

The mouthparts of arthropods have evolved into a number of forms, each adapted to a different style of feeding. They are all developed, however, from the same basic form. Most of the parts used for feeding are modified, paired appendages, the exception being the labrum, which is a single, fused plate (though it was originally - and is embryonically - two structures); it is the front-most of the mouthparts and located on the midline.