Spatial Location of the Mentolabial Sulcus on the Male Head Viewed Laterally

Description

Seen in lateral profile, the mentolabial sulcus forms a shallow, horizontal furrow immediately inferior to the vermilion border of the lower lip and superior to the mental prominence of the chin. Its contour lies anterior to the mandibular body and curves toward the midline at the menton, with the pogonion projecting anteriorly just below the sulcus. Soft tissue depth varies along the crease, blending superiorly into the sublabial region and inferiorly into the mental soft tissues overlying the symphysis menti. Small changes in shadow define it. Clinically, this groove is a key surface landmark when assessing lower facial proportion and chin-lip balance in adult male patients, where soft tissue thickness and beard-bearing skin can mask subtler contour changes. Hypertrophy or hyperactivity of the mentalis muscle can accentuate the mentolabial crease and contribute to a pebbled chin appearance, a common indication discussed in botulinum toxin planning and orthognathic consultation. A reliable reference point for preoperative photography and profile analysis. Use this lateral head view in facial anatomy teaching, craniofacial and maxillofacial surgery texts, and aesthetic medicine materials covering chin augmentation, genioplasty, or lower lip contouring, where consistent nomenclature around the mental region and pogonion matters for annotation. Anatomical accuracy verified by SciePro's Medical Advisory Board.