The Editor.
Diagram of Anterior Zones on one side of the body.
Both right and left sides of the body are the same.
Each numbered line represents the center of its respective zone on the anterior part of the body.
The tongue, hard and soft palate, posterior wall of the nasopharynx and oropharynx, and the generative organs are in ten zones, five on each side of the median line.
The middle ear is in Zone 4.
The eustachian tube and middle ear combined are in Zones 3 and 4.