The inferior alveolar injection goes through which foramen?

• A. Mandibular foramen
• B. Mental foramen
• C. Foramen ovale
• D. Incisive foramen

Answer: (A)

The main idea is that the inferior alveolar nerve block targets the nerve as it enters the mandible. The inferior alveolar nerve travels into the bone through the mandibular foramen on the inner surface of the mandibular ramus. Depositing anesthetic in the pterygomandibular space surrounds the nerve right before it enters the mandibular canal, producing anesthesia to the lower teeth on that side (and, via the mental nerve branch, to the chin and lower lip after it exits at the mental foramen). The mental foramen is where the mental nerve exits, not where the IA nerve enters, so anesthesia there wouldn’t cover the teeth. The foramen ovale and the incisive foramen are in different regions and contexts and do not relate to the entry point of the inferior alveolar nerve.