what is the eustachian tube what does it do
The eustachian tube is a canal that connects the middle ear to the nasopharynx, which consists of the upper throat and the back of the nasal cavity.It controls the pressure within the middle ear, making it equal with the air pressure outside the body.he eustachian tube is a canal that connects the middle ear to the nasopharynx, which consists of the upper throat and the back of the nasal cavity.