tubal air cells of pharyngotympanic tube

tub·al air cells of pha·ryn·go·tym·pan·ic tube

(tū'băl ār selz fă-ring'gō-tim-pan'ik tūb)
Occasional small air cells in the inferior wall of the pharyngotympanic tube, near the tympanic orifice, communicating with the tympanic cavity.