<prompt> The muscle which is required to open Eustachian tube.Tensor veli palatini muscleSalpingo pharyngeusTensor tympaniLevator veli palatini  <response>: Eustachian tube isclosed at restopens intermittentlyduring swallowingyawningsneezing. Opening of the tube The medial fibres of thetensor veli palatiniare attached to the lateral lamina of the tube and contract to open the tubal lumen. They are also calleddilator tubaemuscle. Accessory muscles for opening areLevator veli palatine Salpingopharyngeus. Closure of the tube It is mainly due toelastic recoil of the cailageaided by the high degree of elastin on the roof. Ostmanns pad of fathelps to keep the tube closed. 