The foramen through which the mandibular division of the trigeminal nerve exits the skull is?

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A useful way to think about this is how the trigeminal nerve branches exit the skull. The mandibular division, which carries motor fibers to the muscles of mastication and sensory fibers to the lower face and jaw, leaves the skull through an oval opening in the sphenoid bone—the foramen ovale. This contrasts with the maxillary division, which exits through the foramen rotundum, and the ophthalmic division, which passes via the superior orbital fissure. The foramen magnum is the large opening at the base of the skull for the brainstem and spinal cord. So the path for the mandibular division is the foramen ovale.