Fig. 7 Anterior view of orbital septum and related structures. The medial deep orbital insertion of the orbicularis muscle carries the orbital septum behind it. The septal attachments to the levator aponeurosis in the upper lid and inferior tarsus in the lower lid are also demonstrated, as well as the anatomic relationships to the structures of the upper lid. (AE, arcuate expansion of the inferior oblique; CFP, central fat-pad; IO, inferior oblique muscle; LA, levator aponeurosis; LCT, lateral canthal tendon; LFP, lateral fat-pad; LGO, lacrimal gland orbital lobe; LGP, lacrimal gland palpebral lobe; LLR, lower lid retractors; MCT, medial canthal tendon; MFP, medial fat-pad; OS, orbital septum; STA, supratrochlear artery, nerve, vein; SOA, supraorbital artery, nerve, vein; TP, tarsal plate; Tr, trochlea; WL, Whitnall's ligament)