part of part of surrounds surrounds membrane organ orbit of skull orbital septum http://upload.wikimedia.org/wikipedia/commons/1/18/Gray891.png septum orbitale EMAPA:37609 SCTID:368859002 MA:0001259 UBERON:0001822 Wikipedia:Orbital_septum FMA:59328 A membranous sheet that acts as the anterior boundary of the orbit. It extends from the orbital rims to the eyelids[WP]. musculoskeletal system septum eyelid tarsus