7/4/2023 0 Comments Opening of auditory tube![]() Mucosa has a property that it absorbs oxygen from the surface, which means the middle ear has more carbon dioxide and less oxygen as compared to atmospheric air. The middle ear is lined by mucosa and it's almost a closed cavity. The advantage of closing the eustachian tube at rest is that it prevents food and infection going into the middle ear. At yawning or swallowing, the soft palate moves, which leads to the contraction of tensor veli palatini, which opens the eustachian tube, the air enters the middle ear and air pressure is restored. It maintains middle ear air pressure equal to outside atmospheric pressure.Patients of cleft palate have ET dysfunction that lead to middle ear disorders because in cleft palate the muscles won't be able to meet in the centre. Tensor veli palatini goes down, takes a turn in pterygoid hamulus and is attached in the centre (soft palate). Tensor veli palatini contracts and opens the eustachian tube. Levator pili palatini and tensor veli palatini attached to the anterior surface. Tensor and Levator Vili PalatiniĮustachian tube opens in the lateral wall of the nasopharynx, just behind the nasal cavity. Secondary function of the levator veli palatini is opening of the eustachian tube. When tensor veli palatini contracts, pulls the cartilage of the eustachian tube anteriorly, that leads to opening of the eustachian tube. The median fibres of tensor veli palatini is the main opener or dilator of the eustachian tube. The eustachian tube is closed at rest and that is because of Ostmans Pad of Fat. Keeps the eustachian tube in a closed position. The narrowest part (junction of bone and cartilage)is approximately 3mm Ostmans Pad of Fat ET has middle ear opening (5mmX2mm), has broader opening in the pharynx (8mmX3mm). Since the ET is shorter and horizontal in children, the children are more prone to middle ear infection. Incase of neonates, this ET is always horizontal and tube length is always half of it. ET is an angle of 45 degrees to the horizontal plane. The cartilaginous end of the eustachian tube protrudes in a nasopharynx called Torus Tubarius. Isthmus is located on a bony cartilaginous junction. The narrowest part of ET is known as Isthmus. This tube connects the lateral part of nasopharynx to the anterior wall of the tympanic cavity (middle ear). Anatomy of Eustachian TubeĮustachian tube (ET) also called auditory tube or pharyngo tympanic tube. This is a high-yield topic for ENT subject and it is highly important for NEET PG exam Preparation. Let’s learn more about it including its physiology, anatomy and diagnostic tests. Remember the pop sound that your ear makes sometimes? That’s a blocked Eustachian Tube releasing air. The Eustachian Tube connects the middle ear to the upper pharynx and equalizes air pressure on either side of the air drum.
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