Branching Patterns of Mental Nerve in Newborns

Area of Science:

• Anatomy
• Oral and Maxillofacial Surgery

Background:

• Classical anatomy textbooks describe the mental nerve as a trifurcation of the inferior alveolar nerve.
• However, specific names and distributions of its terminal branches are often not detailed.
• Existing anatomical nomenclature designates three terminal branches: labial, gingival, and mental.

Purpose of the Study:

• To investigate the actual branching patterns of the mental nerve in newborns.
• To compare observed branching with established anatomical descriptions.

Main Methods:

• Bilateral dissections of lower lip specimens from 20 newborns were performed.
• Forty mental nerves were analyzed to classify their branching types.
• Branching patterns were categorized into Forms I, II, III, and a Complex Form.

Main Results:

• The mental nerve exhibited 1, 2, or 3 terminal branches upon exiting the mental foramen, deviating from the typical textbook trifurcation.
• Form II (two branches) was the most frequent pattern, observed in 41.9% of specimens.
• Form III (three branches) occurred in 32.0%, Form I (one branch) in 15.8%, and Complex Form in 10.5%.

Conclusions:

• The branching patterns of the mental nerve are more variable than traditionally taught.
• These findings highlight the need for updated anatomical descriptions of the mental nerve's terminal branching.
• Understanding this variability is crucial for procedures involving the mental nerve in the mandibular region.