mental foramen n.
The front opening of the mandibular canal on the body of the mandible alongside and above the tubercle of the chin.
The position of the mental foramen relative to the anterior part of the ridge varies with individuals and according to species.
The mental foramen lies immediately anterior, or anteroventral, to the fossa.
The mental foramen is immediately anterior, and slightly ventral, to the anterior extension of the crest.