The Phylogenetic History of Paranasal Air Sinuses
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منابع مشابه
Morphometric examination of the paranasal sinuses and mastoid air cells using computed tomography.
BACKGROUND The paranasal sinuses and mastoid air cells vary considerably in size and shape from person to person. The main structures are pneumatic. In this study, we investigated the relationship between right and left sides and evaluated the volume changes according to age and sex. METHODS Of all patients attending the radiology department, 91 cases without paranasal sinuses and mastoid air...
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This overview assesses some distinguishing features of the cetacean (whale, dolphin, porpoise) air sac system that may relate to the anatomy and function of the paranasal sinuses in terrestrial mammals. The cetacean respiratory tract has been modified through evolution to accommodate living in water. Lack of paranasal sinuses in modern cetaceans may be a diving adaptation. Bone-enclosed air cha...
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Objective- to provide a reference anatomy of the paranasal sinuses of the goat by using computed tomographic modality. Design- Experimented study. Animals- Five male Rayini goats. Procedures- CT images were acquired from the head region perpendicular to the hard palate. CT windows were adjusted as necessary to obtain the optimal image for the paranasal sinuses. The images were studie...
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Introduction: Since demand for computed tomography (CT) examinations is growing, patients are exposed more frequently to ionizing radiation. To reduce the dose delivered to patients in each scan, CT technologists can change the image acquisition parameters. However, this reduces image quality. Present study aimed to optimize and reduce radiation dose in a CT of the paranasal si...
متن کاملThe paranasal air sinuses of predatory and armored dinosaurs (archosauria: theropoda and ankylosauria) and their contribution to cephalic structure.
The paranasal air sinuses and nasal cavities were studied along with other cephalic spaces (brain cavity, paratympanic sinuses) in certain dinosaurs via CT scanning and 3D visualization to document the anatomy and examine the contribution of the sinuses to the morphological organization of the head as a whole. Two representatives each of two dinosaur clades are compared: the theropod saurischia...
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تاریخ انتشار 2007