Bigonial width is a measure of jaw width from gonion to gonion (the apex of the mandible and lower jaw). Men tend to have larger bigonial widths while women have smaller ones.

What is Bigonial distance?

The distance between the two gonia. The gonion is the anthropometric point at the most inferior, posterior, and lateral points on the angle of the mandible. See also: diameter.

How wide should jaw be?

Many muscles and nerves around your jaw work together to open and close your mouth. Most people can open their mouth 35 to 55 millimeters (1.4 to 2.2 inches), which is about the width of 3 fingers (see Figure 2).