Anatomical characteristics of the fossula fenestrae vestibuli

AbstractAnatomical characteristics of the fossula fenestrae vestibuli were tested and analysed precisely on 200 samples of temporal bones. The fossula is usually ovoid and shallow but can be, exceptionally, elongated, narrow and deep. It is surrounded by four walls. In 45.5 per cent of cases the upper wall is formed only by the facial canal and in 54.5 per cent of cases a bony lamella is found beneath the facial canal; the promontory forms the lower wall; the front wall is formed by the bony lamella and part of the processus cochleariformis; the back wall is clearly defined in only 22.8 per cent of cases and is formed by the bony lamella of the medial wall of the tympanic cavity. In 13.2 per cent of cases the floor of the fossula partially covers the prominence of the facial canal and in two per cent the eminentia pyramidalis. Bony recesses in this region occur fairly frequently: sinus subfacialis in 60 per cent, sinus retrofenestralis in 77.2 per cent, and sinus subrostralis in 25 per cent of the cases. These anatomical variations can influence the result of surgical intervention.

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Surgical anatomy of the hypotympanum

The Journal of Laryngology & Otology ◽

10.1017/s0022215100101938 ◽

1987 ◽

Vol 101 (5) ◽

pp. 419-425 ◽

Cited By ~ 10

Author(s):

D. SaviČ ◽

D. Djerič

Keyword(s):

Internal Carotid ◽

Outer Wall ◽

Petrous Bone ◽

Jugular Bulb ◽

Surgical Anatomy ◽

Front Wall ◽

Tympanic Cavity ◽

Lower Wall ◽

Back Wall ◽

Temporal Bones

AbstractAnatomical characteristics of the hypotympanum were tested on 50 temporal bones. The hypotympanum has the shape of an irregular bony groove which is surrounded by five walls. The outer wall is formed by the tympanic part of the temporal bone. In 65 per cent of the cases the inner wall is formed by part of the petrous bone which extends under the promontory; in 25 per cent it is formed only by the lower part of the promontory; and in 10 per cent it corresponds to the juncture of the promontory and the petrous bone. The lower wall is clearly defined in 48.2 per cent of cases and corresponds to the juncture of its inner and outer walls. In 65 per cent of cases a recess of the inferior hypotympanic sinus is found on the floor of the hypotympanum. In 25.3 per cent of cases the jugular bulb protrudes into the tympanic cavity. In 73.4 per cent of cases the front wall is formed by part of the petrous bone which extends from its floor towards the tympanic opening of the protympanum, and in 26 per cent of the cases it is formed by the wall of the internal carotid artery. On the front wall, in 22.4 per cent of cases, a recess of the anterior hypotympanic sinus is found. The back wall is formed by elements of the styloid complex and in five per cent of the cases a recess or posterior hypotympanic sinus is found on it.

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R435 – Stapedius Muscle Relations to the Facial Canal

Otolaryngology ◽

10.1016/j.otohns.2008.05.591 ◽

2008 ◽

Vol 139 (2_suppl) ◽

pp. P190-P190

Author(s):

Alaa A. Abou-Bieh ◽

Thomas J Haberkamp ◽

Jarah Ali Al-Tubaikh

Keyword(s):

Facial Nerve ◽

Temporal Bone ◽

Anatomical Variations ◽

Surgical Anatomy ◽

Facial Canal ◽

Sinus Tympani ◽

Stapedius Muscle ◽

Facial Nerve Canal ◽

Tendon Insertion ◽

Temporal Bones

Problem The gross anatomical variations of the stapedius muscle and its relations to the facial nerve canal. Methods Thirty-five temporal bones were dissected, and the anatomic details were studied utilizing an operating microscope and otoendoscopes with 0o, 30o and 70o angles and 2.7 and 3 mm diameters. The muscle origin, its course in its bony sulcus with its relation to the facial nerve canal, the tendon and its insertion were studied. Results Marked variations in the origin, size, and course of the muscle in its bony sulcus were detected. The shape of the sulcus itself and its relation to the facial nerve canal varied also, both mainly influenced by the sinus tympani development. These variations affected the shape and length of the tendon and the pyramidal eminence. In addition, they influenced the site of tendon insertion into the stapes. The presence of ectopic muscle bundles was confirmed in one specimen. Conclusion The stapedius muscle anatomy can vary significantly from one temporal bone to another. In some situations these variations can be of surgical importance worse enough to be recognized. Significance To add important unrecognized data to the surgical anatomy of the temporal bone.

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Facial Canal Anatomy in Patients with Microtia: Evaluation of the Temporal Bones with Thin-Section CT

Radiology ◽

10.1148/radiol.2253010942 ◽

2002 ◽

Vol 225 (3) ◽

pp. 852-858 ◽

Cited By ~ 25

Author(s):

Hideki Takegoshi ◽

Kimitaka Kaga ◽

Shigeru Kikuchi ◽

Ken Ito

Keyword(s):

Thin Section ◽

Facial Canal ◽

Temporal Bones

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Determination of the Anatomical Features of the Temporal Bones at the Stage of Planning Extraoral Implantation in Ectoprosthetics of the Auricle

Radiology - Practice ◽

10.52560/2713-0118-2021-2-12-24 ◽

2021 ◽

pp. 12-24

Author(s):

D. A. Lezhnev ◽

S. D. Arutyunov ◽

E. Yu. Lazarenko ◽

M. V. Magomedbekova

Keyword(s):

Surgical Intervention ◽

Maxillofacial Surgery ◽

Present Stage ◽

High Quality ◽

Anatomical Features ◽

Prosthetic Reconstruction ◽

Intervention Planning ◽

Temporal Bones ◽

Fixation System

At the present stage of the development of maxillofacial surgery, the treatment of patients with defects in the auricles is one of the most difficult. Defects of the auricles, characterized by its absence, are divided according to the etiological factor into two main groups: congenital (microtia) and acquired (as a result of injuries of various origins). Microtia (including anotia the complete absence of the auricle) is a malformation of the auricle and the external auditory canal caused by anomalies of the first and second zygomatic arch and the first sulcus.Congenital malformations of the auricle occur in 1 out of 700–15 000 newborns and more often have a right-sided localization. In 15 % of cases, they are hereditary, and in 85 % they are sporadic, in boys they are detected on average 2–2,5 times more often than in girls.Currently, much attention is paid to the prosthetic reconstruction of the auricle with fixation by means of cranial intraosseous implants. At the same time precise diagnostics of the state of the temporal bones in the area of the proposed implantation and the correct positioning of the intraosseous supports are the basis of an effective fixation system. Among the methods of radiological diagnostics used for planning ectoprosthetics of the auricles, radiography has long been preferred. However, the introduction of computed tomography into clinical practice has provided a high-quality assessment of the temporal bones state, which has increased the efficiency of surgical intervention planning and treatment.

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Analysis of tympanic sinus shape for purposes of intraoperative hearing monitoring: a microCT study

Surgical and Radiologic Anatomy ◽

10.1007/s00276-021-02859-7 ◽

2021 ◽

Author(s):

Małgorzata Bilińska ◽

Tomasz Wojciechowski ◽

Jacek Sokołowski ◽

Kazimierz Niemczyk

Keyword(s):

Computed Tomography ◽

Round Window ◽

Optimal Placement ◽

Facial Canal ◽

Average Width ◽

Sinus Tympani ◽

Stapedius Muscle ◽

Electrode Shape ◽

Posterior Tympanotomy ◽

Temporal Bones

Abstract Purpose Sinus tympani is the space in the retrotympanum, with variable morphology. Computed tomography is a common tool to investigate sinus tympani anatomy. During cochlear implantation or tympanoplasty, electrocochleography can be used for hearing monitoring. In such a surgical strategy the electrode is placed in the round window’s region throughout posterior tympanotomy. Common accessible needle-shaped electrodes using is difficult in achieving intraoperative stabilization. The aim of the study is to assess the dimensions and shape of sinus tympani, basing on the micro computed tomography scans for purposes of establishing the possible new electrocochleography electrode shape. Materials and methods Sixteen fresh frozen cadaveric temporal bones were dissected. MicroCT measurements included the depth and the width of sinus tympani, width of facial canal with stapedius muscle chamber. Obtained data were analyzed statistically with the use of RStudio 1.3.959 software. Results The highest average width of sinus tympani amounted for 2.68 mm, depth measured at the round window plane for 3.19 mm. Width of facial canal with stapedius muscle chamber highest average values at the round window plane- 3.32 mm. The lowest average minimum and maximum values were calculated at the 1 mm above the round window plane. The highest average posterior tympanotomy width was 2.91 mm. Conclusions The shape of the tympanic sinus is like a trough with the narrowest and deepest dimensions in the middle part. The ST shape and dimensions should be taken into account in constructing the ECochG electrode, designed for optimal placement through posterior tympanotomy approach.

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EVALUATION OF DIAGNOSTICNASAL ENDOSCOPY AND CTSCAN IN VARIOUS SINONASAL DISEASES

International Journal of Advanced Research ◽

10.21474/ijar01/13662 ◽

2021 ◽

Vol 9 (10) ◽

pp. 1144-1149

Author(s):

Ranjan Kumar ◽

◽

Rajeev Chandra ◽

Om Prakash ◽

◽

...

Keyword(s):

Ct Scan ◽

Surgical Intervention ◽

Maxillary Sinusitis ◽

Anatomical Variation ◽

Cost Effective ◽

Anatomical Variations ◽

Nasal Endoscopy ◽

Common Finding ◽

Polyp Detection ◽

Intervention Patient

Objective:To evaluate role of Diagnostic Nasal Endoscopy and CT scan in various Sinonasaldiseases with regards to diagnosis and surgical intervention. Patient and methods:This prospective study was carried out in Department of ENT, A.N.M.M.C.H., Gaya on 200 patients with clinical evidence of sinonasal disease who had presented between March 2016 to February 2019. All patients were evaluated with DNE using 0 degree 4mm endoscope and CT scan with 3 mm coronal cuts. Result: Female patients(56%) were more as compared to male(44%) with majority between 21 - 40 yrs. Most common finding on Diagnostic Nasal Endoscopy(DNE) was mucopurulent discharge in middle meatuswhile on CT Scan was maxillary sinusitis(60%). Sinonasal polyp detection was better with DNE.CT has better detection rate of anatomical variation of osteomeatal complex. Conclusion : DNE has become initial tool for diagnosis as it is cost effective and office based procedure. In patients where surgical intervention is required, CT scan has advantage as it provides detailed understanding of anatomical variations. So bothDNE and CT scan should be used in collaborative fashion. Source Of Support:Patients of A.N.M.C.H., Gaya. Conflict Of Interest:None.

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Anatomical variations and relations of large blood vessels to the tympanic cavity

Surgical and Radiologic Anatomy ◽

10.1007/s00276-014-1370-y ◽

2014 ◽

Vol 37 (4) ◽

pp. 327-331 ◽

Cited By ~ 1

Author(s):

Srbislav Blazic ◽

Milanko Milojevic ◽

Ugljesa Grgurevic ◽

Dragoslava Djeric

Keyword(s):

Blood Vessels ◽

Anatomical Variations ◽

Tympanic Cavity

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Study on Stressed Characteristic of Gridding Concrete Retaining Wall Used in Excavation of Soft-Soil Foundation Pit

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.2266 ◽

2011 ◽

Vol 243-249 ◽

pp. 2266-2270

Author(s):

Guang Zhu Zhou ◽

Xu Wei ◽

Chen Yu

Keyword(s):

Retaining Wall ◽

Soft Soil ◽

Side Wall ◽

Building Envelope ◽

Front Wall ◽

Soil Pressure ◽

Back Wall ◽

Foundation Pit ◽

Partition Wall ◽

Finite Element Software

As a new type of building envelope, Gcrw is mainly used for excavation of foundation pit. It can stand by itself without the help of bracing, especially in soft soil area. Its stressed characteristic hasn’t been known yet. By using advanced big finite element software Abaqus/Cae, a simulation was made on model of Gcrw under soil pressure when a foundation pit is dug, while the whole excavation is divided into three continuous independent excavation stages. The result shows that Gcrw is a rather good building envelope, Gcrw and soil in the gridding form an integral earth-retaining structure and keep balance under soil pressure before or behind the structure, and have little displacement in horizontal direction. It is like a gravity-type retaining wall in its entirety, but takes on an elastic characteristic. The soil pressure presents a linear change, but its value is less than the theoretical value of calculation. The front wall of Gcrw, like a sheet, is the main flexural construction element, which is subjected to the pressure from side wall of foundation pit and produce curve deformation. The back wall of Gcrw has little displacement and almost is built in the clay. The partition wall endures the effect of the tensile force, its horizontal deformation increases with the build-in depth’s increasing. The back wall and the partition wall play a very important role in dragging back the front wall, the role of them is similar to a pair of anchor tie. The soil in the gridding not only provides soil pressure, but also can fix the back wall, so it is seen as a part of Gcrw and in favor of the Gcrw’s anti-overturn.

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