Salivary receptacle: a small cavity above the opening of the salivary duct, between labium and hypopharynx.
The labrum is considered by some authorities to be the hypopharynx.
hypopharynx: a sensitive and sensory structure on the upper surface of labium that serves as an organ of taste, or true tongue.
Distinct and conspicuous maxillulae are associated with the tongue or hypopharynx.
Endolabium: the inner or mouth surface of the labium: the hypopharynx when that is well developed.
Just below this is the hypopharynx, the lateral margins of which are very thin.
hypopharynx hy·po·phar·ynx (hī'pō-fār'ĭngks)