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KMID : 0602819960020010071
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Korean Journal of Bronchoesophagology
1996 Volume.2 No. 1 p.71 ~ p.81
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Laryngeal Measurement on Neck CT
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Abstract
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The normal larynx locates to the front of the neck symmetrically and the thyroid notch
lies in the center of the neck, but practically the larynx is not symmetric in all people. From
a clinical point of views, there are vague cases to decide whether a disordered laryngeal
structure is within normal variations or a pathologic condition. The purpose of this study is
to investigate the anatomy of the laryngeal framework population.
Authors investigate various measures of normal laryngeal framework, such as symmetry and
length and protractor on 45 cases of neck CT. The results are summerized as follows.
1. The laryngeal framework was asymmetric to a greater or lesser extent in most cases with
directional preponderance to the right side. The degree of as ymmetry did not differ among
different age goups and between sexes.
2. The level of the hyoik bone ranged from C2-C3 vertebrae to C5-C6 intervertebral space
with most frequent level of C5.
3. The level of the vocal cord ranged from C4 vertebra to C6-C7 intervertebral space with
most frequent level of C5.
4. The angle of thyroid cartilage ranged from 58 degree to 100 degree with average of 81.5
and mean angle between both thyoid alae were 77.24 degree in male and 87.88 degree in
female.
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