What is the primary nerve affected during a mandibular nerve block?

• A. Maxillary nerve
• B. Mandibular nerve
• C. Inferior alveolar nerve
• D. Facial nerve

Answer: (C)

The primary nerve affected during a mandibular nerve block is the inferior alveolar nerve. This specific nerve is a branch of the mandibular nerve, which is itself a division of the trigeminal nerve (cranial nerve V).

When administering a mandibular nerve block, the goal is to achieve anesthesia of the inferior alveolar nerve, which innervates the lower teeth, the body of the mandible, and portions of the lower lip and chin. By targeting the inferior alveolar nerve during the block, dental practitioners can effectively manage pain during procedures involving the lower jaw, such as extractions or fillings.

The other options represent different nerves. The maxillary nerve is responsible for sensation in the upper jaw and does not play a role in mandibular anesthesia. The facial nerve is primarily involved in motor functions of facial expression rather than sensory innervation of teeth, and while the mandibular nerve is indeed the broader category that includes the inferior alveolar nerve, it is not the most specific answer when identifying which nerve is primarily affected during the block.