After surgery of 3rd molar, patches of anaesthesia on chin is due to damage of
**Core Concept**
The question tests the knowledge of the innervation of the chin area, specifically the branches of the mandibular division of the trigeminal nerve (V3). The mental nerve, a branch of the inferior alveolar nerve, provides sensation to the lower lip and chin.
**Why the Correct Answer is Right**
The mental nerve is responsible for transmitting sensory information from the lower lip and chin to the trigeminal ganglion. Damage to this nerve during surgery of the third molar can result in patches of anesthesia on the chin. The mental nerve arises from the inferior alveolar nerve, which is a branch of the mandibular division of the trigeminal nerve (V3).
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the innervation of the chin area. The buccal nerve provides sensation to the cheek, not the chin.
**Option B:** The lingual nerve provides sensation to the anterior two-thirds of the tongue and the floor of the mouth, not the chin.
**Option C:** The auriculotemporal nerve provides sensation to the temple and the external auditory meatus, not the chin.
**Clinical Pearl / High-Yield Fact**
The mental nerve is a branch of the inferior alveolar nerve, which can be damaged during third molar surgery, leading to anesthesia of the chin area. This is an important consideration for surgeons and anesthesiologists to avoid postoperative complications.
**Correct Answer:** C.