![]() One of the main hypotheses states that the mastoid works as a gas reservoir used to compensate for pressure variations inside the middle ear together with the eustachian tube 2–5. The role of the mastoid is yet to be clarified, despite the many theories on the matter. The mastoid air cell system accounts for most of the volume of the middle ear cleft and, consequently, for most of the mucosa available for gas exchange 2. Therefore, the total mucosal surface area has direct impact on gas exchange rates 1. Gas exchanges are carried out through the air cell mucosa. Both compartments are lined by the same respiratory mucosa. The posterior-superior compartment comprehends the epitympanum and the retrotympanum, the aditus ad antrum and the antrum mastoideum, and the mastoid air cell system it is primarily devoted to gas exchange. The anterior-inferior compartment's main role is clearance, and it includes the protympanum, the mesotympanum, and the hypotympanum. The middle ear cleft is divided by the tympanic isthmus into anterior-inferior and posterior-superior compartments. Further studies with larger populations will provide evidence as to whether Brazilian subjects have larger surface areas and volumes than other populations. Mean surface areas and volumes were higher than previously published, unlike surface area-to-volume ratios, which were lower. Mastoid surface areas and volumes of adult Brazilian subjects followed a linear correlation, as also described in studies carried out in other countries. Surface areas varied linearly with volumes. Surface areas ranged from 43.9 to 525.2 cm 2. Mastoid volumes ranged from 5.5 to 72.4 cm 3. Measurements of surface area and volume were made based on serial CT scans and produced with the aid of software package Image Pro Plus. This contemporary cross-sectional cohort study included 28 patients submitted to CT imaging of the mastoid. To check the ratio between mastoid surface area and volume. These measurements add to the understanding of middle ear physiology, related diseases, and their impact on mastoid pneumatization. See moreĬomputed tomography-based measurements of mastoid surface area and volume have not been described for adult Brazilian individuals. ![]() Open Access funded by Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial. Its abbreviated title is Braz J Otorhinolaryngol., which should be used in bibliographies, footnotes and bibliographical references and strips.Īll articles will be published under the CC BY (Creative Commons Attribution 4.0 International). ![]() It is the official scientific publication of the Brazilian Association of Otolaryngology and Cervicofacial Surgery. ![]() The Brazilian Journal of Otorhinolaryngology is born from the 'Revista Brasileira de Otorrinolaringologia', of which it is the English version, created and indexed to MEDLINE in 2005. The aim of this journal is the national and international divulgation of the scientific production interesting to the otolaryngology, as well as the discussion, in editorials, of subjects of scientific, academic and professional relevance. The Brazilian Journal of Otorhinolaryngology publishes original contributions in otolaryngology and the associated areas (cranio-maxillo-facial surgery, head and neck surgery, and phoniatrics).
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