The Experts below are selected from a list of 1689 Experts worldwide ranked by ideXlab platform
Hernán Marani - One of the best experts on this subject based on the ideXlab platform.
-
Tympanic Cavity and paraTympanic spaces of R. equinus (MPEF PV 695).
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:(A) CT slice at the level of Tympanic bullae. (B) Left Tympanic bulla transversally sectioned to appreciate internal morphology. (C) Squamosal + left Tympanic bulla parasagittally sectioned to appreciate internal morphology of Tympanic Cavity and epiTympanic sinus. Schemas on the left indicate orientation and cut planes. Striped areas represent cut surfaces. Dotted line in C shows the connection between Tympanic Cavity and epiTympanic sinus via the foramen pneumaticum. Anatomical abbreviations: bo, basioccipital; eepe, endocranial exposure of petrosal; es, epiTympanic sinus; iab, interior of auditory bulla; iaotm, internal aperture of the ossified tubular meatus; otg, orbitotemporal groove; pa, parietal; pgc, postglenoid canal; pr, promontory of petrosal; ptyc, paraTympanic Cavity; sq, squamosal. Scale bar equals 2 cm.
-
Axial CT slice of R. equinus (MPEF PV 695) at level of the jugular foramen.
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:Anatomical abbreviations: bs, basisphenoid; eam, external auditory meatus; ica, internal carotid artery; jf, jugular foramen; mc, meatal crest; pa, parietal; pet, petrosal; pocp, paraoccipital process; smf, suprameatal foramen; sq, squamosal; ts, temporal sinus; tyc, Tympanic Cavity. Scale bar equals 1 cm.
-
Cranial Morphology of the Late Oligocene Patagonian Notohippid Rhynchippus equinus Ameghino, 1897 (Mammalia, Notoungulata) with Emphases in Basicranial and Auditory Region
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:“Notohippidae” is a probably paraphyletic family of medium sized notoungulates with complete dentition and early tendency to hypsodonty. They have been recorded from early Eocene to early Miocene, being particularly diverse by the late Oligocene. Although Rhynchippus equinus Ameghino is one of the most frequent notohippids in the fossil record, there are scarce data about cranial osteology other than the classical descriptions which date back to the early last century. In this context, we describe the exceptionally preserved specimen MPEF PV 695 (based on CT scanning technique and 3D reconstruction) with the aim of improving our knowledge of the species, especially regarding auditory region (petrosal, Tympanic and surrounding elements), sphenoidal and occipital complexes. Besides a modular description of the whole skull, osteological correlates identified on the basicranium are used to infer some soft-tissue elements, especially those associated with vessels that supply the head, mainly intracranially. One of the most informative elements was the petrosal bone, whose general morphology matches that expected for a toxodont. The endocranial surface, together with the surrounding parietal, basisphenoid, occipital, and squamosal, enabled us to propose the location and communication of main venous sinuses of the lateral head wall (temporal, inferior and sigmoid sinuses), whereas the Tympanic aspect and the identification of a posterior carotid artery canal provided strong evidence in support of an intraTympanic course of the internal carotid artery, a controversial issue among notoungulates. Regarding the arrangement of Tympanic and paraTympanic spaces, the preservation of the specimen allowed us to appreciate the three connected spaces that constitute a heavily pneumatized middle ear; the epiTympanic sinus, the Tympanic Cavity itself, and the ventral expansion of the Tympanic Cavity through the notably inflated bullae. We hope this study stimulates further inquires and provides potentially informative data for future research involving other representatives of the order.
Gastón Martínez - One of the best experts on this subject based on the ideXlab platform.
-
Tympanic Cavity and paraTympanic spaces of R. equinus (MPEF PV 695).
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:(A) CT slice at the level of Tympanic bullae. (B) Left Tympanic bulla transversally sectioned to appreciate internal morphology. (C) Squamosal + left Tympanic bulla parasagittally sectioned to appreciate internal morphology of Tympanic Cavity and epiTympanic sinus. Schemas on the left indicate orientation and cut planes. Striped areas represent cut surfaces. Dotted line in C shows the connection between Tympanic Cavity and epiTympanic sinus via the foramen pneumaticum. Anatomical abbreviations: bo, basioccipital; eepe, endocranial exposure of petrosal; es, epiTympanic sinus; iab, interior of auditory bulla; iaotm, internal aperture of the ossified tubular meatus; otg, orbitotemporal groove; pa, parietal; pgc, postglenoid canal; pr, promontory of petrosal; ptyc, paraTympanic Cavity; sq, squamosal. Scale bar equals 2 cm.
-
Axial CT slice of R. equinus (MPEF PV 695) at level of the jugular foramen.
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:Anatomical abbreviations: bs, basisphenoid; eam, external auditory meatus; ica, internal carotid artery; jf, jugular foramen; mc, meatal crest; pa, parietal; pet, petrosal; pocp, paraoccipital process; smf, suprameatal foramen; sq, squamosal; ts, temporal sinus; tyc, Tympanic Cavity. Scale bar equals 1 cm.
-
Cranial Morphology of the Late Oligocene Patagonian Notohippid Rhynchippus equinus Ameghino, 1897 (Mammalia, Notoungulata) with Emphases in Basicranial and Auditory Region
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:“Notohippidae” is a probably paraphyletic family of medium sized notoungulates with complete dentition and early tendency to hypsodonty. They have been recorded from early Eocene to early Miocene, being particularly diverse by the late Oligocene. Although Rhynchippus equinus Ameghino is one of the most frequent notohippids in the fossil record, there are scarce data about cranial osteology other than the classical descriptions which date back to the early last century. In this context, we describe the exceptionally preserved specimen MPEF PV 695 (based on CT scanning technique and 3D reconstruction) with the aim of improving our knowledge of the species, especially regarding auditory region (petrosal, Tympanic and surrounding elements), sphenoidal and occipital complexes. Besides a modular description of the whole skull, osteological correlates identified on the basicranium are used to infer some soft-tissue elements, especially those associated with vessels that supply the head, mainly intracranially. One of the most informative elements was the petrosal bone, whose general morphology matches that expected for a toxodont. The endocranial surface, together with the surrounding parietal, basisphenoid, occipital, and squamosal, enabled us to propose the location and communication of main venous sinuses of the lateral head wall (temporal, inferior and sigmoid sinuses), whereas the Tympanic aspect and the identification of a posterior carotid artery canal provided strong evidence in support of an intraTympanic course of the internal carotid artery, a controversial issue among notoungulates. Regarding the arrangement of Tympanic and paraTympanic spaces, the preservation of the specimen allowed us to appreciate the three connected spaces that constitute a heavily pneumatized middle ear; the epiTympanic sinus, the Tympanic Cavity itself, and the ventral expansion of the Tympanic Cavity through the notably inflated bullae. We hope this study stimulates further inquires and provides potentially informative data for future research involving other representatives of the order.
Michael S Cohen - One of the best experts on this subject based on the ideXlab platform.
-
prolonged radiant exposure of the middle ear during transcanal endoscopic ear surgery
Otolaryngology-Head and Neck Surgery, 2015Co-Authors: Parth V Shah, Elliott D Kozin, Aaron K Remenschneider, Matthew M Dedmon, Hideko Heidi Nakajima, Michael S CohenAbstract:Transcanal endoscopic ear surgery (EES) provides a high-resolution, wide-field view of the middle ear compared with the conventional operating microscope, reducing the need for a postauricular incision or mastoidectomy. Our group has shown in cadaveric human temporal bone studies that radiant energy from the endoscope tip can quickly elevate temperatures of the Tympanic Cavity. Elevated temperatures of the middle ear are associated with acute auditory brainstem response shifts in animal models. In EES, proposed methods to decrease middle ear temperature include frequent removal of the endoscope and the use of suction to rapidly dissipate heat; however, the routine application of such cooling techniques remains unknown. Herein, we aim to quantify the duration that the Tympanic Cavity is typically exposed to the endoscope during routine endoscopic middle ear surgery. We find that the Tympanic Cavity is exposed to the endoscope without a cooling mechanism for a prolonged period of time.
Elliott D Kozin - One of the best experts on this subject based on the ideXlab platform.
-
prolonged radiant exposure of the middle ear during transcanal endoscopic ear surgery
Otolaryngology-Head and Neck Surgery, 2015Co-Authors: Parth V Shah, Elliott D Kozin, Aaron K Remenschneider, Matthew M Dedmon, Hideko Heidi Nakajima, Michael S CohenAbstract:Transcanal endoscopic ear surgery (EES) provides a high-resolution, wide-field view of the middle ear compared with the conventional operating microscope, reducing the need for a postauricular incision or mastoidectomy. Our group has shown in cadaveric human temporal bone studies that radiant energy from the endoscope tip can quickly elevate temperatures of the Tympanic Cavity. Elevated temperatures of the middle ear are associated with acute auditory brainstem response shifts in animal models. In EES, proposed methods to decrease middle ear temperature include frequent removal of the endoscope and the use of suction to rapidly dissipate heat; however, the routine application of such cooling techniques remains unknown. Herein, we aim to quantify the duration that the Tympanic Cavity is typically exposed to the endoscope during routine endoscopic middle ear surgery. We find that the Tympanic Cavity is exposed to the endoscope without a cooling mechanism for a prolonged period of time.
Javier N. Gelfo - One of the best experts on this subject based on the ideXlab platform.
-
Tympanic Cavity and paraTympanic spaces of R. equinus (MPEF PV 695).
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:(A) CT slice at the level of Tympanic bullae. (B) Left Tympanic bulla transversally sectioned to appreciate internal morphology. (C) Squamosal + left Tympanic bulla parasagittally sectioned to appreciate internal morphology of Tympanic Cavity and epiTympanic sinus. Schemas on the left indicate orientation and cut planes. Striped areas represent cut surfaces. Dotted line in C shows the connection between Tympanic Cavity and epiTympanic sinus via the foramen pneumaticum. Anatomical abbreviations: bo, basioccipital; eepe, endocranial exposure of petrosal; es, epiTympanic sinus; iab, interior of auditory bulla; iaotm, internal aperture of the ossified tubular meatus; otg, orbitotemporal groove; pa, parietal; pgc, postglenoid canal; pr, promontory of petrosal; ptyc, paraTympanic Cavity; sq, squamosal. Scale bar equals 2 cm.
-
Axial CT slice of R. equinus (MPEF PV 695) at level of the jugular foramen.
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:Anatomical abbreviations: bs, basisphenoid; eam, external auditory meatus; ica, internal carotid artery; jf, jugular foramen; mc, meatal crest; pa, parietal; pet, petrosal; pocp, paraoccipital process; smf, suprameatal foramen; sq, squamosal; ts, temporal sinus; tyc, Tympanic Cavity. Scale bar equals 1 cm.
-
Cranial Morphology of the Late Oligocene Patagonian Notohippid Rhynchippus equinus Ameghino, 1897 (Mammalia, Notoungulata) with Emphases in Basicranial and Auditory Region
2016Co-Authors: Gastón Martínez, María Teresa Dozo, Javier N. Gelfo, Hernán MaraniAbstract:“Notohippidae” is a probably paraphyletic family of medium sized notoungulates with complete dentition and early tendency to hypsodonty. They have been recorded from early Eocene to early Miocene, being particularly diverse by the late Oligocene. Although Rhynchippus equinus Ameghino is one of the most frequent notohippids in the fossil record, there are scarce data about cranial osteology other than the classical descriptions which date back to the early last century. In this context, we describe the exceptionally preserved specimen MPEF PV 695 (based on CT scanning technique and 3D reconstruction) with the aim of improving our knowledge of the species, especially regarding auditory region (petrosal, Tympanic and surrounding elements), sphenoidal and occipital complexes. Besides a modular description of the whole skull, osteological correlates identified on the basicranium are used to infer some soft-tissue elements, especially those associated with vessels that supply the head, mainly intracranially. One of the most informative elements was the petrosal bone, whose general morphology matches that expected for a toxodont. The endocranial surface, together with the surrounding parietal, basisphenoid, occipital, and squamosal, enabled us to propose the location and communication of main venous sinuses of the lateral head wall (temporal, inferior and sigmoid sinuses), whereas the Tympanic aspect and the identification of a posterior carotid artery canal provided strong evidence in support of an intraTympanic course of the internal carotid artery, a controversial issue among notoungulates. Regarding the arrangement of Tympanic and paraTympanic spaces, the preservation of the specimen allowed us to appreciate the three connected spaces that constitute a heavily pneumatized middle ear; the epiTympanic sinus, the Tympanic Cavity itself, and the ventral expansion of the Tympanic Cavity through the notably inflated bullae. We hope this study stimulates further inquires and provides potentially informative data for future research involving other representatives of the order.
