Through which foramen does the mandibular nerve pass in the skull?

• A. Foramen Ovale
• B. Foramen Rotundum
• C. Superior Orbital Fissure
• D. Foramen Spinosum

Answer: (A)

The route of the mandibular division of the trigeminal nerve as it exits the skull is through the foramen ovale. This opening provides the passage from the cranial cavity into the infratemporal fossa for the division that carries both sensory fibers to lower face and motor fibers to the muscles of mastication. The other openings serve different branches or structures: the foramen rotundum transmits the maxillary division, the superior orbital fissure transmits the ophthalmic division along with other nerves, and the foramen spinosum mainly carries the middle meningeal vessels (and a small meningeal nerve). Since the mandibular division is destined to supply the lower face and motor functions for chewing, its exit through the foramen ovale is the correct route.