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is situate at the posterior part of the angle formed by the union of the internal and inferior parietes of the orbit. It is constituted, above, by the sphenoid bone; below, by the superior maxillary and palate bones; and, before, by the malar bone. It is narrower at the middle than at the extremities, and forms a communication between the orbitar cavity and the zygomatic fossa.

A f. between the lateral margin of the superior maxilla and the orbital plate of the sphenoid bone. It transmits the infra-orbital vessels and nerve.