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- The outer rim of the auricle is called the helix, which then inferiorly ends as soft tissue known as the lobule of auricle (or ear lobe).
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Oct 2, 2016 · Most of the middle ear pathologies appear as “soft tissue” on imaging. Careful analysis of the soft tissue on the HRCT is crucial in achieving the right diagnosis; clinical information is essential and the imaging findings need correlation with clinical presentation and otoscopic findings.
- External and Middle Ear Diseases
In these cases, CT cannot distinguish between different...
- External and Middle Ear Diseases
Nov 3, 2023 · The medial aspect of the ear lobe is attached to the skull and has no major practical significance. The lateral aspect is concave and presents numerous grooves and ridges. The outer rim of the auricle is called the helix, which then inferiorly ends as soft tissue known as the lobule of auricle (or ear lobe). The helix has three parts: crus ...
- Tympanic Orifice
- Osseous Portion
- Cartilaginous Portion
- Pharyngeal Orifice
Thetympanic orificeof the Eustachian tube marks the opening of the tube into the middle ear. It is located just above themiddle ear floor. Anterolateral to this opening is Huguier’s canal – where the chorda tympani nerve leaves the middle ear. The internal carotid arteryis closely associated with the medial wall of the Eustachian tube at the tympan...
The osseous portionrefers to the third of the Eustachian tube nearest to the middle ear. It can be variably surrounded by peritubal air cells. Along the roof of the osseous part of the Eustachian tube is a canal containing the tensor tympani muscle. The distal end of the osseous portion is formed by the petrous part of the temporal bone. It has a s...
The cartilaginous portionrefers to the two-thirds of the Eustachian tube nearest to the nasopharynx. It lies in a groove between the petrous part of the temporal bone and the greater wing of the sphenoid bone (petrosphenoidal fissure). The cartilaginous part is incomplete along the lower and lateral margin of the tube, and is completed by fibrous t...
The pharyngeal orificemarks the opening of the Eustachian tube into the nasopharynx. It is located posteriorly to the inferior concha of the nasal cavity. The epithelial lining of the tube near the pharyngeal orifice is ciliated pseudostratifiedwith goblet cells.
Nov 15, 2021 · The eustachian tube, also called the pharyngotympanic tube, connects the middle ear to the nasopharynx. Like these two areas, it is also lined with a mucous membrane. This tube is shorter and straighter in children, so it is easier for pathogenic organisms to travel between the ear and nasopharynx.
- Natasha Beard
Jun 26, 2023 · Structure and Function. The Eustachian tube plays a role in equalization, oxygenation, and drainage of the tympanic cavity in the middle ear. More specifically, the Eustachian tube permits equalization of pressure in the middle ear with respect to ambient pressure.
- Alice Szymanski, Amit Agarwal
- University of Texas Southwesten
- 2018
- 2023/06/26
Surrounded by soft tissue and muscles, it connects the tympanic orifice in the anterior wall of the middle ear to the nasopharyngeal orifice, which is posterior to the inferior nasal concha and lateral to the adenoid pad.
Oct 30, 2023 · It is lined by mucous membrane and communicates with the nasopharynx anteriorly via the pharyngotympanic (Eustachian) tube and the mastoid antrum and air cells posteriorly. Structurally, the middle ear is made up of two parts: the tympanic cavity and epitympanic recess.
