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Of these there are several :-1. The Foramen orbitarium superius, (F.) Trou orbitaire superieur, which is situate at the junction of the inner third of the orbitar arch with its two outer thirds, and gives passage to the frontal nerve. 2. The Foramina orbitaria interiora seu interna, Foramina Ethmoidea. These are situate at the upper part of the internal paries of the orbit, are formed by the union of two notches of the os frontis with two similar ones of the ethmoid; and are distinguished into anterior and posterior. The former gives passage to the ethmoidal filament of the nasal nerve and to a small artery.