Behind and medial to the maxillary lobes are salivary gland invaginations. Posterior to the maxillary lobes are labial lobes, and even more posterior are the first thoracic segments. Shown from anterior to posterior are the clypeolabrum, stomodeum, flanked laterally and posteriorly by prominent hypopharyngeal lobes. More posteriorly and laterally are the mandibular lobes. The labial lobes, flanking the salivary gland invaginations which have fused to form a common duct, have moved toward the midline.
Maxillary lobes are posterior to and lateral of the mandibular lobes.
A stage 14 embryo at the beginning of hypopharyngeal lobe invagination through the stomodeum. The labial appendages have moved closer to the midline. The anlagen of the mandibular sense organs show as depressions in the middle of the mandibular appendages. The hypopharyngeal lobes have invaginated through the stomodeum. Surrounding the stomodeum are anteriorly, the clypelabium, laterally, the mandibular appendages, and posteriorly, the labial appendages.