The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform
Hugo Estibeiro - One of the best experts on this subject based on the ideXlab platform.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane
Otolaryngology–Head and Neck Surgery, 2020Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:Objectives The purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications. Methods 100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin. Results We established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterior Tympanic spine. In association, we established that at this level there was a decrease in the annulus caliber. Additionally, in 25% of cases, given the absence of the circular fibers of lamina propria, the postero-superior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in the postero-superior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide the origin of cholestheatoma.
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The posterosuperior quadrant of the Tympanic membrane.
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:Abstract Objective To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. Study Design Point-prevalence study of postmortem material. Subjects and Materials One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. Results We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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The posterosuperior quadrant of the Tympanic membrane
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:OBJECTIVE: To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. STUDY DESIGN: Point-prevalence study of postmortem material. SUBJECTS AND MATERIALS: One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. RESULTS: We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. CONCLUSIONS: Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane:
Otolaryngology-Head and Neck Surgery, 2008Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:ObjectivesThe purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications.Methods100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin.ResultsWe established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterio...
Diogo Oliveira E Carmo - One of the best experts on this subject based on the ideXlab platform.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane
Otolaryngology–Head and Neck Surgery, 2020Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:Objectives The purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications. Methods 100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin. Results We established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterior Tympanic spine. In association, we established that at this level there was a decrease in the annulus caliber. Additionally, in 25% of cases, given the absence of the circular fibers of lamina propria, the postero-superior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in the postero-superior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide the origin of cholestheatoma.
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The posterosuperior quadrant of the Tympanic membrane.
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:Abstract Objective To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. Study Design Point-prevalence study of postmortem material. Subjects and Materials One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. Results We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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The posterosuperior quadrant of the Tympanic membrane
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:OBJECTIVE: To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. STUDY DESIGN: Point-prevalence study of postmortem material. SUBJECTS AND MATERIALS: One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. RESULTS: We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. CONCLUSIONS: Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane:
Otolaryngology-Head and Neck Surgery, 2008Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:ObjectivesThe purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications.Methods100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin.ResultsWe established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterio...
Carla Branco - One of the best experts on this subject based on the ideXlab platform.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane
Otolaryngology–Head and Neck Surgery, 2020Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:Objectives The purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications. Methods 100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin. Results We established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterior Tympanic spine. In association, we established that at this level there was a decrease in the annulus caliber. Additionally, in 25% of cases, given the absence of the circular fibers of lamina propria, the postero-superior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in the postero-superior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide the origin of cholestheatoma.
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The posterosuperior quadrant of the Tympanic membrane.
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:Abstract Objective To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. Study Design Point-prevalence study of postmortem material. Subjects and Materials One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. Results We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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The posterosuperior quadrant of the Tympanic membrane
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:OBJECTIVE: To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. STUDY DESIGN: Point-prevalence study of postmortem material. SUBJECTS AND MATERIALS: One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. RESULTS: We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. CONCLUSIONS: Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane:
Otolaryngology-Head and Neck Surgery, 2008Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:ObjectivesThe purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications.Methods100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin.ResultsWe established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterio...
João Paço - One of the best experts on this subject based on the ideXlab platform.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane
Otolaryngology–Head and Neck Surgery, 2020Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:Objectives The purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications. Methods 100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin. Results We established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterior Tympanic spine. In association, we established that at this level there was a decrease in the annulus caliber. Additionally, in 25% of cases, given the absence of the circular fibers of lamina propria, the postero-superior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in the postero-superior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide the origin of cholestheatoma.
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The posterosuperior quadrant of the Tympanic membrane.
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:Abstract Objective To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. Study Design Point-prevalence study of postmortem material. Subjects and Materials One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. Results We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. Conclusions Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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The posterosuperior quadrant of the Tympanic membrane
Otolaryngology-Head and Neck Surgery, 2009Co-Authors: João Paço, Carla Branco, Hugo Estibeiro, Diogo Oliveira E CarmoAbstract:OBJECTIVE: To document the anatomic relationship of the posterosuperior segment of the Tympanic membrane. STUDY DESIGN: Point-prevalence study of postmortem material. SUBJECTS AND MATERIALS: One hundred seventy temporal bones from adults without history of otologic pathology were studied. The anatomic details of the Tympanic membrane were observed, histology was documented on 30 sectioned bones, and, with the use of the scanning electron microscope, lamina propria was studied in 40 bones. RESULTS: We established that the posterosuperior quadrant was the largest, representing 28.7 percent of the total area of the eardrum. This feature implies that this quadrant is more likely than are the other quadrants to exhibit changes prompted by pressure challenges. We also verified that the posterosuperior part of Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way in 60 percent of the cases. In association, we established that at this level there was a decrease in annulus caliber. In 25 percent of cases, by the absence of the circular fibers of lamina propria, the posterosuperior quadrant had only the radial fiber layer. CONCLUSIONS: Anatomic and morphologic details in posterosuperior quadrant were newly described and may explain the greater incidence of retraction pockets and marginal perforations that provide origin for the cholesteatoma.
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S221 – The Postero-superior Quadrant of the Tympanic Membrane:
Otolaryngology-Head and Neck Surgery, 2008Co-Authors: Carla Branco, João Paço, Diogo Oliveira E Carmo, Hugo EstibeiroAbstract:ObjectivesThe purpose of this study was to document the anatomic relationship of the postero-superior segment of the Tympanic membrane and its clinical implications.Methods100 temporal bones from adults without history of otologic pathology were studied. The morphological and anatomical details of the Tympanic membrane were observed in 70 bones, which implied the use of macroscopic sections of the bones. The histological results were documented in 30 serially sectioned bones, stained previously with hematoxylin-eosin.ResultsWe established that the postero-superior quadrant was the largest in size, with a mean dimension of 21.05 mm2, which represents 28.7% of the total area of the Tympanic membrane. This feature implies that this quadrant is more exposed to pressure changes. We also verified that the posterosuperior part of the Tympanic sulcus, above the chorda Tympanic Nerve, lost its depth in an unexpected way (60%) or that it gradually diminished from 0.9 to 0.5 mm until it disappeared near the posterio...
Berthold Hedwig - One of the best experts on this subject based on the ideXlab platform.
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Tympanic membrane oscillations and auditory receptor activity in the stridulating cricket Gryllus bimaculatus
The Journal of Experimental Biology, 2001Co-Authors: James F.a. Poulet, Berthold HedwigAbstract:The ears of stridulating crickets are exposed to loud self-generated sounds that might desensitise the auditory system and reduce its responsiveness to environmental sounds. We examined whether crickets prevent self-induced auditory desensitisation, and measured the responsiveness of the peripheral auditory system of the cricket (acoustic spiracle, Tympanic membrane and Tympanic Nerve) during pharmacologically induced sonorous (two-winged) and silent (one-winged) stridulation. The acoustic spiracles remained open during stridulation, so the self-generated auditory signal had full access to both the external side and the internal side of the Tympanic membrane. When the spiracles shut in resting crickets, the responsiveness of the Tympanic membrane to acoustic stimuli varied according to the phase of ventilation and was minimal during expiration. The Tympanic membrane oscillated in phase with the self-generated sounds during sonorous chirps and did not oscillate during silent chirps. In both sonorously and silently singing crickets, the responses of the Tympanic membrane to acoustic stimuli were identical during the chirps and the chirp intervals. Bursts of activity were recorded in the Tympanic Nerve during sonorous chirps; however, activity was minor during silent chirps. In sonorously and in silently singing crickets, the summed Nerve response to acoustic stimuli in the chirp intervals was the same as in resting crickets. The response to stimuli presented during the syllable intervals of sonorous chirps was slightly reduced compared with the response in the chirp intervals as a consequence of receptor habituation. In silently singing crickets, acoustic stimuli elicited the same summed Nerve response during chirps and chirp intervals. These data indicate that in the cricket no specific mechanism acts to reduce the responsiveness of the peripheral auditory pathway during stridulation.
