Bony Orbital Anatomy of the Koala (Phascolarctos cinereus)
R. C. KEMPSTER AND L. W. HIRST*
Division of Ophthalmology, Department of Surgery, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia
This is the ﬁrst documented study of the anatomical details of the normal koala orbit. Baseline data are established which are necessary for understanding and treating ocular disease in the koala (Phascolarctos cinereus). The bony anatomy of the orbit of the koala was examined and described from animals that presented dead or had been euthanized for humane reasons. Dissections of the orbital cavity were performed under magniﬁcation, and descriptions of the orbital bones were from macerated skulls that had been boiled and cleaned. In general, the orbital bones of the koala, and their respective foramina, are consistent with those of other carnivorous polyprotodont and herbivorous diprotodont marsupials.