Arcuate eminence in Caucasian populations

2001 ◽  
Vol 115 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Atsunobu Tsunoda
Keyword(s):  
Temporal Lobe ◽  
Semicircular Canal ◽  
Middle Cranial Fossa ◽  
Tympanic Cavity ◽  
Lateral Semicircular Canal ◽  
Superior Semicircular Canal ◽  
Cranial Fossa ◽  
Temporal Bones

The arcuate eminence (AE) was studied in 21 Caucasian cadavers (42 temporal bones), with particular reference to its relationship to the superior semicircular canal (SSC) and the temporal lobe. An arc-like eminence was observed in over 80 per cent of specimens, however, they did not exactly correspond to the SSC and such eminences corresponded to the sulci of the temporal lobe. The round and domed eminence corresponded to each SSC in seven temporal bones. The distances between the SSC and the middle cranial fossa were varied (0–2.5 mm, mean: 1.2 mm+± 0.6 mm) whereas distances between the lateral semicircular canal and tympanic cavity were relatively consistent (0.6–1.4 mm, mean: 1.0 mm ± 0.2 mm).These data indicate that the AE is trace of the temporal lobe and the SSC gave little effect to the surface of the middle cranial fossa. These findings could well be applicable to all humans.

scholarly journals Euclidean Relationship between the Superior Semicircular Canal and the Arcuate Eminence

2019 ◽  
Vol 81 (02) ◽  
pp. 165-171 ◽  
Author(s):  
Aida Nourbakhsh ◽  
Yang Tang ◽  
Brian S. DiPace ◽  
Daniel H. Coelho
Keyword(s):  
Semicircular Canal ◽  
Euclidean Distance ◽  
Three Dimensional ◽  
Middle Cranial Fossa ◽  
Surgical Anatomy ◽  
P Value ◽  
Middle Fossa ◽  
Superior Semicircular Canal ◽  
Cranial Fossa ◽  
Academic Teaching Hospital

Abstract Objective This study was aimed to better characterize the surgical anatomy of the floor of the middle cranial fossa using three dimensional Euclidean relationships between the arcuate eminence (AE), the superior semicircular canal (SSC), and the geniculate ganglion (GG). Study Design Submillimeter distances were recorded from computed tomography (CT) scans of 50 patients (100 sides). The AE, apex of the SSC, and the GG were identified and three dimensional distances measured. Setting The study was conducted at a tertiary academic teaching hospital. Main Outcome Measures In this study, Euclidean distance was obtained from AE to SSC by using a fixed anatomical landmark (GG) as the origin. Results On average, the AE is 2.1 ± 0.3 mm lateral, 2.5 ± 0.1 mm superior, and 2.1 ± 0.3 posterior to the SSC. Thirty percent (30/100) of patients had an AE that was less than 2 mm superior to SSC. The AE was medial to the SCC in 13% samples and anterior to the SSC in 18% samples. The results also show that there was no difference in mean distance between sides (1.08 mm; 95% confidence interval [CI] =  − 2.67–0.52; p-value = 0.29) or gender (0.56 mm; 95% CI =  − 1.34, 2.45; p-value = 0.86). Conclusions This study represents a comprehensive analysis of the relational anatomy of the floor of the middle fossa to date. In quantifying relationships between the AE, SSC, and GG, and by understanding the variability of these relationships in some planes, the middle fossa surgeon can feel more comfortable with this most challenging approach.

Superior semicircular canal dehiscence syndrome

2004 ◽  
Vol 100 (1) ◽  
pp. 123-124 ◽  
Author(s):  
Mitchell J. Ramsey ◽  
Michael J. McKenna ◽  
Fred G. Barker
Keyword(s):  
Semicircular Canal ◽  
Chronic Otitis Media ◽  
Middle Cranial Fossa ◽  
Content Type ◽  
Superior Semicircular Canal Dehiscence ◽  
Superior Semicircular Canal ◽  
Cranial Fossa ◽  
Vestibular Symptoms ◽  
Fine Print ◽  
Canal Dehiscence

✓ The authors present the case of a man who had superior semicircular canal dehiscence syndrome in addition to chronic otitis media. This case is atypical because the patient coincidentally had middle ear and mastoid disease, which previously had been treated surgically. The prior ear surgery delayed the diagnosis of superior semicircular canal dehiscence syndrome and increased the complexity of the repair of the superior semicircular canal dehiscence. Superior semicircular canal dehiscence syndrome is a recently recognized syndrome resulting in acute or chronic vestibular symptoms. The diagnosis is made using history, vestibular examination, and computerized tomography studies. Neurosurgeons should be aware that patients with superior semicircular canal dehiscence syndrome who experience disabling chronic or acute vestibular symptoms can be treated using a joint neurosurgical—otological procedure through the middle cranial fossa.

The arcuate eminence is not a protrusion of the superior semi-circular canal but a trace of sulcus on the temporal lobe

2000 ◽  
Vol 114 (5) ◽  
pp. 339-344 ◽  
Author(s):  
Atsunobu Tsunoda ◽  
Yurika Kimura ◽  
Takuro Sumi ◽  
Atsushi Komatsuzaki ◽  
Tatsuo Sato
Keyword(s):  
Temporal Lobe ◽  
Internal Auditory Canal ◽  
Middle Cranial Fossa ◽  
Petrous Bone ◽  
The Other ◽  
Inferior Surface ◽  
Important Landmark ◽  
Cranial Fossa ◽  
Temporal Bones ◽  
Occipitotemporal Sulcus

Thirteen cadavers (26 temporal bones) were examined to show the arcuate eminence, especially its correspondence to the superior semicircular canal and inferior surface of the temporal lobe. Arc-like eminences on the petrous bone were observed in 92 per cent of specimens, however, they did not exactly correspond to the superior semi-circular canal. Some eminences corresponded to sulci of the temporal lobe of which most were traces of the occipitotemporal sulcus.On the other hand, a dull, smooth and even domed eminence existed in nine temporal bones independently of the arc-like eminence. Those eminences corresponded to each superior semi-circular canal in only three out of nine specimens.The arcuate eminence was listed as an important landmark in the middle cranial fossa approach. However, in order to drill out the internal auditory canal safely, surgeons should rely on other landmarks or apply other methods from our data.

Dehiscence of the bony roof of the superior semicircular canal in the middle cranial fossa

2002 ◽  
Vol 116 (7) ◽  
pp. 514-518 ◽  
Author(s):  
Atsunobu Tsunoda ◽  
Omi Terasaki
Keyword(s):  
Semicircular Canal ◽  
Simulation Models ◽  
Middle Cranial Fossa ◽  
Cadaveric Specimen ◽  
Superior Semicircular Canal ◽  
Cranial Fossa ◽  
Dry Bone ◽  
Computer Simulation Models ◽  
Middle Cranial Fossa Surgery ◽  
Clinical Problems

Spontaneous dehiscence of the superior semicircular canal (SSC) in the middle cranial fossa is rare and may cause clinical problems. This dehiscence was investigated in cadaveric and dried temporal bone specimens. One cadaveric specimen showed a spontaneous defect: the dehiscence was a symmetrical, elongated ellipse with smooth margins. Four of 244 dry bone specimens showed bony defects in the roof of the SSC, however, only one specimen was thought to have a spontaneous defect. Based on computer-simulation models, we hypothesized that spontaneous defects of the SSC may arise during the fetal period. Although rare, this defect may cause problems in middle cranial fossa surgery and may relate to certain vertiginous disorders.

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