ABSTRACT
The orbit contains and protects the globe and the visual apparatus. It is described as a quadrilateral pyramid with the base projecting forwards and laterally with the apex postero-medial between the optic foramen and the medial end of the superior orbital fissure. The periorbita adheres loosely to the bones of the orbit except at the orbital rim, the sutures, fissures and foramina and is readily lifted by both tumours and infection, offering little resistance to either. The medial orbital walls are parallel to each other whilst the lateral walls are at an angle of 45 degrees to the medial walls. If the lateral orbital walls are traced posteriorly they intersect at an angle of 90 degrees in the middle fossa.
