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Cranial Nerve V: The Trigeminal Nerve Stemming from the lateral superior margin of the left and right side of the pons, this nerve branches into three: V/I ophthalmic, V/II maxillary and V/III mandibular nerves. These branches exit the skull through the superior orbital fissure (V/I), the foramen rotundum (V/II) and the foramen ovale (V/III). This nerve governs the sensory innervation of the face, sinuses and teeth.
Foraminal Narrowing. A foramen is an opening in a vertebra through which the nerve roots leave the spine. Each vertebra has two foramina, one on either side. From the foramina, the nerve fibers travel to all regions of the body. With foraminal narrowing, this opening becomes partially blocked, causing a painful compression of the nerves.