Fig. 1.

The tensor veli palatini muscle originates from the cranial base and lateral side of the auditory tube (Eustachian tube). In this figure, the tensor veli palatini muscle’s auditory tube origin is represented at the cartilaginous and membranous parts of the lateral auditory tube. Before entering the soft palatum, the tensor veli palatini muscle tendon wraps itself around pterygoid hamulus. Insertion ratio: The insertion ratio as described by Matsune and Sando [13] is calculated by the length of Eustachian tube cartilage involved by insertion of the tensor veli palatini muscle at the auditory tube (line B) divided by the total length of the Eustachian tube (line A); the length of the auditory tube cartilage from the nasopharyngeal end to isthmus portion. (Figure adapted from Matsune et al. [13])