Above, it is related to frontal lobe cerebrum and meninges. A defect in the orbital roof may cause pulsatile proptosis as a result of transmission of cerebrospinal fluid pulsation to the orbit. It is located adjacent to anterior cranial fossa and the frontal sinus. The RoofĬonsists of two bones: wing of the sphenoid none and orbital plate of frontal bone. this allows for significant forward displacement of the globe without excessive stretching of optic nerve. The intra orbital portion of the optic nerve is longer than the distance between the back of globe and the optic canal. The orbit is a pear shaped cavity, the stalk of which is the optic canal. The patterns of anatomic involvement can be divided into anterior, diffuse, apical, myopathic, ocular, intraconal, optic nerve, periorbital and lacrimal drainage system. The effect of any disease in the orbit is not only governed by the primary nature of the process but also by the anatomic pattern of involvement. Orbit, orbital disease, clinical, cranial nerves Introduction The medial walls are parallel to each other at a distance of 2.5 cms but the lateral walls are set at right angles to each other. The long axis of the each orbit passes backwards and medially. Nature has provided orbit for the safety of the eyeball. Out of 12 pairs of cranial nerves 2nd, 3rd, 4th, 6th,a part of 5th and some sympathetic fibers are are also present in the orbit. The orbits are boney cavities lodging the eyeballs, extraoccular muscles, nerves, blood vessels and lacrimal gland.
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