Mouth Anatomy 1. Open your frog's mouth very wide, cutting the angles of the jaw if necessary. Identify the tongue attached to the lower jaw's anterior end. Find the Eustachian tube opening into the angle of the jaws. These tubes lead to the ears.
Eustachian tubes equalize air pressure in the ears.
Examine the maxillary teeth located along the rim of the upper jaw. Another set of teeth, the vomerine teeth, is present just behind the mid portion of the upper jaw. Locate the glottis, a slit through which air passes in and out of the trachea, the short tube from the glottis to the lungs. Identify the esophagus. which lies dorsal and posterior to the glottis and leads to the stomach.