orbital opening
(redirected from aditus orbitalis)or·bi·tal o·pen·ing
[TA]the somewhat quadrangular anterior entrance to the orbit that forms the base of the pyramidal orbital cavity. It is bounded by the sharp supraorbital, infraorbital, and lateral orbital margins and a less obvious medial margin on each side of the upper nose.
Synonym(s): aditus orbitalis [TA], aperture of orbit