Inferior Alveolar Nerve
Also written as: IAN — Inferior Alveolar Nerve
A branch of the mandibular division of the trigeminal nerve (V3) that runs through the mandibular canal, providing sensory innervation to the mandibular teeth, lower lip, and chin.
Full Definition
The inferior alveolar nerve (IAN) is of paramount importance in dentoalveolar and maxillofacial surgery because of its proximity to the roots of mandibular molars and its course through the mandibular canal. Surgical procedures in the posterior mandible — particularly third molar removal and implant placement — carry a risk of IAN injury, which may result in temporary or permanent altered sensation (paraesthesia, hypoaesthesia, or anaesthesia) of the lower lip and chin. Editors will encounter this nerve named in risk disclosures, consent forms, surgical notes, and medico-legal reports. The correct anatomical name is 'inferior alveolar nerve'; 'inferior dental nerve' is an older synonym now largely superseded in modern texts.
Usage
Usage note: Abbreviate to 'IAN' only after definition on first use. 'Inferior dental nerve' is an acceptable historical synonym but should not be introduced without explanation in modern documents.
In Context
- "The consent form documented the risk of inferior alveolar nerve injury, with an estimated incidence of 0.5–5% for surgical third molar removal." — Consent Form
- "Postoperative paraesthesia of the lower lip was attributed to transient neuropraxia of the inferior alveolar nerve." — Discharge Summary