The ostium for the maxillary sinus opens posteriorly in this groove and is the largest ostium within the semilunar hiatus. The Eustachian tube is a complex structure connecting the middle ear to the nasopharynx that contributes to the normal function of the middle ear. WHAT IS THE EUSTACHIAN TUBE The Eustachian tube is an airway passage which connects the middle ear to the back of the nose/throat. When the anterior end of the uncinate process fuses with the front part of the bulla, however, this continuity is interrupted and the frontonasal duct then drains directly into the anterior end of the middle meatus. The auditory tube (also known as the pharyngotympanic tube, Eustachian tube, Latin: tuba auditiva) is a tunnel that connects the tympanic cavity to the. Synonym (s): tubal tonsil eustachian tube - a tube leading from the tympanic cavity to the nasopharynx. In slightly over 50% of subjects, this is directly continuous with the frontonasal duct from the frontal air sinus. eustachian tonsil - a collection of lymphoid nodules near the pharyngeal opening of the auditory tube. The anterior ethmoidal cells of the ethmoidal sinus open into the front part of the infundibulum as well. It is bounded inferiorly and anteriorly by the sharp concave margin of the uncinate process of the ethmoid bone, superiorly by the ethmoid bulla, and posteriorly by the middle nasal concha.įollowing the curve anteriorly leads into the infundibulum of the frontonasal duct, which drains the frontal sinus. Also called auditory tubes, eustachian tubes keep the middle ears healthy by equalizing pressure, draining fluids, and protecting your middle ears from pathogens that could cause infections. It is the location of the openings of the maxillary sinuses. The eustachian tubes connect your middle ears to the upper part of the throat behind the nose. Eating and drinking may also mobilise the Eustachian tube to allow some air travel through the tube. The latter arises from the hook of the cartilage and from the membranous part of the tube, and blends below with the Tensor veli palatini. Yawn or open your mouth widely as if you were yawning. It opens into the lateral wall of naopharynx by passing through the gap between the base of skull and superior constrictor of pharynx. it lies in sulcus tubae (formed by articulation of petrous part of temporal bone with greater wing or sphenoid). The semilunar hiatus or hiatus semilunaris, is a crescent-shaped groove in the lateral wall of the nasal cavity just inferior to the ethmoid bulla. The tube is opened during deglutition by the Salpingopharyngeus and Dilatator tub. Auditory tube is divided into two parts: Cartilaginous part it forms anterior 2/3rd.
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