Nervus mentalis

Mental nerve is a sensory nerve which provides sensation to the front of the chin and lower lip as well as the labial gingivae of the mandibular anterior teeth and the premolars.

It is a branch of the posterior trunk of the inferior alveolar nerve, which is itself a branch of the mandibular division of the trigeminal nerve (CN V). The nerve emerges at the mental foramen in the mandible, and divides beneath the Depressor anguli oris muscle into three branches:

one descends to the skin of the chin. two ascend to the skin and mucous membrane of the lower lip.These branches communicate freely with the facial nerve.