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The vertical cavity between the nose and upper lip, also known as the philtrum, is where the face forms together in the womb. This happens while a fetus is 2-3 months old, and if it has not happened by that time, it most likely never will. Different races have deeper or shallower cavities, which then determines the shape of the lips.
According to the FAS Diagnostic and Prevention Network, there is a guide used by medical professionals to measure the philtrum. Typically, the deeper the philtrum is, the larger the upper lip is as well.
Kean University shows us that the philtrum is considered to be part of the nose. It is a part of the external nose. Everybody has this part on their face, but with varying degrees on the depth.
In humans, Filtrum occurs at the boundaries of where fused maxillary sinuses. It has been proven that even the majority of male patients has been extended philtrum is one of the physical signs that frequently suffer from autism.
As these gaps never joints during formation, remains the gap between the nose and upper lip this cavity usually do not bother anyone, but women who extensible go to that part of the surgery.
The operation of filling the lips can solve this problem by cutting a small portion between the nose and lips and usually remain small scar that cannot be removed.
Filtrum plays a key role because it transmits moisture from the lip to the nose and keeps your nose moist. This helps in better functioning of the sense of smell. It is known that the nose of humans and other primates performs the function better when wet than dry.