The orbit is a bony pyramid with four walls: a roof, lateral wall, floor, and medial wall. The base of the pyramid is the orbital entrance, which is roughly rectangular ().It measures 4 cm wide by ...

The ophthalmic nerve lies below the oculomotor and trochlear nerves and divides into the frontal, lacrimal, and nasociliary nerves. These nerves then enter the orbital cavity (eye socket) through ...