Anatomical variations of the infraorbital nerve
The infraorbital nerve is a direct extension of the maxillary
division of the trigeminal nerve (Fig. 5). It courses anteriorly
through a canal within the bone of the orbital floor and
provides superior alveolar nerves for the sensory innervations
of the maxillary teeth. The infraorbital nerve then emerges
from the infraorbital foramen and gives 4 branches, the
inferior palpebral, the external nasal, the internal nasal and
the superior labial branches for the sensory innervation to the
skin of the eyelid, nose, cheek and upper lip.
The infraorbital foramen is usually (90–97%) single never-
theless, several studies have underlined the presence of two or
three foramina.