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Abstract: Studies done on anatomical variations of laryngeal skeleton are limited throughout the world. Some are based on numerically constricted sample-sizes. This is the pioneer research conducted in Sri Lanka. An awareness of the anatomical variations of this important area is crucial for the accurate interpretation of postmortem findings specially when pressure on the neck is suspected. The study was conducted to identify the common anatomical variations of the hyoid-thyroid complexes, their correlation with the age and sex, using 241 adult postmortem laryngeal skeletons. Ethical clearance was obtained from the ethics review committee of the Colombo South Teaching Hospital. After obtaining the written informed consent from the legal claiments of the body. Hyoid and larynx were removed during routine autopsy, examined afresh after manual de-fleshing, preserved in formalin and carefully dissected and subjected to X-ray. Findings were manually tabulated for each case. Some crucial findings significantly diverge from comparative studies done elsewhere. Fusion of the greater horn of hyoid was very variable with no significant co-relation with the advancement of age. In 13% of cases lesser horns were totally absent. In 80% of cases, lesser horns were symmetrical. In a minority of cases lesser horns were unusual in anatomy. Significant variations of mobility of lesser horns, presence or absence of projections on the body of the hyoid, shape of the hyoid, angle between the thyroid laminae, presence of triticeous cartilages, their site and number, shortening of superior cornua of thyroid, direction, length and angulation of the superior cornua, angle between thyroid laminae etc. had been found. The presence of triticeous cartilages in 63% of cases in Sri Lanka is a notable finding which is prone to be mistaken for a thyroid superior cornual fracture.DOI: http://dx.doi.org/10.51505/ijmshr.2021.5303
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