Which term refers to the two holes located on the front surface of the mandible that permit passage of nerves and blood vessels?

• A. Lingual frenum
• B. Hard palate
• C. Mental foramen
• D. Nasal spine

Answer: (C)

The openings called the mental foramina are the two holes on the front surface of the mandible through which nerves and blood vessels pass. They’re typically located near the premolar area on each side of the chin, and they carry the mental nerve (a branch of the inferior alveolar nerve) along with accompanying vessels to supply the lower lip and chin. This is also why a mental nerve block is performed near these foramina to numb sensation in those regions during dental procedures. The other terms listed aren’t openings in the mandible: the lingual frenum is a tissue fold under the tongue, the hard palate is the roof of the mouth, and the nasal spine is a bony projection near the nasal area—none of them match the function of allowing passage of nerves and vessels through the mandible.