As the trigeminal nerve (actually the ganglion end of the nerve) peels  a few branches off the top into the superior orbital fissure, the rest splits to go elsewhere. The next bundle  from the trigeminal passes into the foramen rotundum.

    This second bundle, the maxillary nerve, splits after it passes the foramen rotundum into the smaller zygomatical facial branch which runs the floor of the orbit then exits through the zygomatic prominence and the larger infraorbital nerve which runs the orbital floor dives into it then out inferior to the orbit. Branches also split before the orbit to dive to the palate and dental regions of the maxilla.


The last parcel of the trigeminal ganglion branch is the mandibular nerve passing through the foramen ovale. It serves the lower law.