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The Eustachian tube (/ j uː ˈ s t eɪ ʃ ən /), also called the auditory tube or pharyngotympanic tube, [1] is a tube that links the nasopharynx to the middle ear, of which it is also a part. In adult humans, the Eustachian tube is approximately 35 mm (1.4 in) long and 3 mm (0.12 in) in diameter. [ 2 ]
•Boyle Davis mouth gag: to keep the mouth open and depress the tongue to operate within or through the mouth; operations in which it is used: tonsillectomy, operation of palate, pharynx, nasopharynx. •Jenning's mouth gag-do- Draffin's bipod metallic stand and Magauran's plate: used to hold the Boyle Davis mouth gag fitted head in a ...
The soft palate in its neutral posture allows air to flow freely through both the nose and mouth. Finally, the Eustachian tubes' apertures are located slightly above the soft palate and in the nasal cavity. These small tubes connect the upper pharynx (also known as the nasopharynx) to the middle ear and are essential for equalization. [8]
Patulous Eustachian tube is a physical disorder. The exact causes may vary depending on the person and are often unknown. [5] Weight loss is a commonly cited cause of the disorder due to the nature of the Eustachian tube itself and is associated with approximately one-third of reported cases. [6]
One of these muscles, the tensor veli palatini, also acts to open the Eustachian tube. This is why swallowing or yawning is successful in equalizing middle ear pressure. Contrary to popular belief, the jaw does not pinch the tubes shut when closed. The Eustachian tubes are not located close enough to the mandible to be pinched off.
Diver clearing ears Section of the human ear, the Eustachian tube is shown in colour. Ear clearing, clearing the ears or equalization is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure.
The sound waves enter the auditory canal, a deceptively simple tube. The ear canal amplifies sounds that are between 3 and 12 kHz . [ 1 ] The tympanic membrane , at the far end of the ear canal marks the beginning of the middle ear .
It arises from the lower part of the cartilage of the Eustachian tube, [1] and inserts into the palatopharyngeus muscle by blending with its posterior fasciculus. It is innervated by vagus nerve (cranial nerve X) via the pharyngeal plexus. It raises the pharynx and larynx during deglutition (swallowing) and laterally draws the pharyngeal walls up.