Biomedical subjects

K Ushiro

Publications and source records attributed to K Ushiro.

20 records · Page 2Linked to original sources

PubMedDate not supplied

Cineradiogrphic analysis of eustachian tube function. Experimental study.

In order to determine the effect of muscular contraction upon the opening processes of the eustachian tube, cineradiography of four monkeys' tubes during stimulation of the tensor and levator veli palatini muscles was carried out. Levator stimulation produced no opening of the tube except a dilation of the pharyngeal orifice. On the other hand, tensor stimulation produced a consistent opening of the tube by outward displacement of the tubal wall along its entire cartilaginous part. A marked time lag in the movement of the tube between its proximal (isthmic) and distal (pharyngeal) parts was regarded to be important in the clearance function of the tube.

Animals↗

PubMedDate not supplied

Role of the tensor tympani muscle in eustachian tube function.

In order to determine the role of the tensor tympani muscle in Eustachian tube function, pressure changes in the external and middle ear of 13 cats were measured under four experimental conditions. It was revealed that contraction of the tensor tympani muscle during swallowing did not result in any tympanic pressure rise which might assist in tubal ventilation. Acoustic stimulation was then used to measure consistent contraction of the tensor tympani muscle. Combined contraction of the tensor veli palatini and tensor tympani muscle under the condition of positive tympanic pressure failed to open the tube. It was concluded that the tensor tympani muscle might not play any part in tubal function.

Acoustic Stimulation↗