[Study on the relationship among the projective positions of interior laryngeal structure on thyroid ala].
OBJECTIVE
To provide anatomic basis of locations of laryngeal interior structures for laryngeal operating through lateral laryngeal approaches in clinic.


METHODS
Thirty cadavers laryngeal cartilage specimens (19 male and 11 female) was collected. Using pin pierced method under direct vision to locate the projections of muscle process of arytenoids cartilage and vocal fold on thyroid ala, then to observe their relationships.


RESULTS
The projection of vocal fold is the line that connecting a little bit superior of the middle point of anterior commissure of thyroid cartilage and the point on the crosspoint of superior 3/4 and inferior 1/4 of the posterior edge of thyroid cartilage ala. The angle of the line and anterior commissure of thyroid cartilage is sixty-five degrees. The projection of muscle process is locating on the projective line of vocal fold. The projection of pyriform fossa is locating at the posterior superior portion of thyroid cartilage ala.


CONCLUSIONS
The interior structures of larynx have a intact relationship of projective position on thyroid cartilage ala,which providing anatomic references for clinical surgeries relating to vocal fold through laryngeal framework.
Zhang
Shiwen
S
Department of Head and Neck Surgery, the Third Affiliated Hospital of Kunming Medical College, China. zhangshiwen3@163.com
Li
Xiaojiang
X
Liu
Zongliang
Z
Zheng
Mingxiu
M
Wang
Zhengqiang
Z
D001193:Arytenoid Cartilage / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007830:Larynx / Q000033:anatomy & histology*; D008297:Male; D013957:Thyroid Cartilage / Q000033:anatomy & histology*