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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.
Description of foraminal stenosis. At every level of the spine, nerve roots branch off the spinal cord and exit the spinal column through small canals. Each of these canals is called an intervertebral foramen or foraminal canal, and foraminal stenosis is a narrowing of this canal.auses of foraminal stenosis. Constriction of the nerve roots leaving the spine in the foraminal canal is typically caused by bone spurs, a herniated or bulging disc, arthritis or ligament thickening.