The width of the hypopharynx and oropharynx before and after the operation
correction of glosso-larynx (CGL) was compared by cranial X-ray film. After
the operation, the hyoid bone was seen to have moved downward, and the cra
nial bone was observed to have rotated forward. As a result, the hypopharyn
x and the oropharynx were expanded. Expansion of the hypopharynx resulted i
n the decreased resistance of flow decreased and the increased in airflow.