FMA definition : Space of compartment of head, each instance of which is bound by the internal surface
of wall of some orbit.;
Anatomy link : http://www.campusdanatomie.org/content/pierre-carpentier-anatomie-oro-faciale-paces-les-cavites-orbitaires-12; http://www.campusdanatomie.org/content/pierre-carpentier-anatomie-oro-faciale-paces-les-cavites-orbitaires-22;