Which nerve is responsible for sensory innervation of the skin on the chin?

The mental nerve is primarily responsible for the sensory innervation of the skin on the chin. It is a branch of the inferior alveolar nerve, which itself arises from the mandibular division of the trigeminal nerve (also known as the fifth cranial nerve). The mental nerve exits the mandibular canal through the mental foramen and supplies sensation to the skin of the chin and the lower lip.

This specific innervation means that any sensory information, such as touch or temperature, from the chin is transmitted via the mental nerve. Understanding this anatomical relationship is crucial for dental professionals, as it can help in accurately diagnosing and managing conditions related to nerve injuries or dental procedures in that area.

Other options, while related to facial sensory function, do not specifically target the skin of the chin. The facial nerve primarily provides motor innervation to the muscles of facial expression and carries some sensory fibers but is not responsible for sensation in the chin area. The trigeminal nerve is a larger nerve that encompasses various branches, but it is not specific to the chin alone. The mandibular nerve, while it is the largest branch of the trigeminal nerve, still requires its subdivision – specifically the mental nerve – to address the chin's sensory input accurately.