Determination of the dimensions of the Eustachian tube in heathland sheep.

<p><b>A</b>: DVT scan. <b>B</b>: segmented tube and middle ear from DVT scan data. The trajectories in the centre of the tube are indicated together with the start and end points (a–e) of each trajectory. <b>C</b>: Cross section of a segmented tube. The dot in the centre marks the position of the trajectory. Perpendicular to it, the diameters were measured. The indicated line refers to a length of 6.6 mm for the larger diameter. <b>D</b>: Macerated silicone model of the tube including (from right to left) tube, middle ear and parts of the outer ear canal.