Body Trivia : Boundary of head and face

Where is the boundary of head and face?

According to the anatomy, a line to reach an earhole through the eyebrows from the root of the nose becomes the boundary line of head and face. 

Therefore, the forehead is also a part of the head and is called a sinciput. 

The forehead is the intervals from the top of the eyebrows to the lowest part of the hair.