What is the name of the transverse facial marking at the junction of the lower lip and chin?

The transverse facial marking at the junction of the lower lip and chin is known as the labio-mental sulcus. This anatomical feature is a groove or indentation that helps define the boundary between the lower lip and the chin, contributing to the overall aesthetics of the face. The labio-mental sulcus is important in both anatomical studies and in the field of mortuary science, as understanding facial landmarks is crucial for restoring the appearance of individuals during the embalming and preparation process.

The labio-mental sulcus is distinct from the nasolabial fold, which refers to the crease running from the side of the nose to the corner of the mouth. The mentolabial sulcus, while also relating to the area around the lip and chin, specifically marks the space between the lower lip and the chin but is not the same as the transverse marking at their junction. The oral commissure denotes the corners of the mouth where the upper and lower lips meet, which is a different anatomical feature entirely. Understanding these distinct landmarks helps in various applications, including cosmetic procedures and forensic identification.