The orbit is a bony socket of the facial skeleton formed around the optic nerve and eyeball. Each orbit is cone-shaped, with the apex pointing posteromedially so that the medial walls of the two orbits are almost parallel while the lateral walls are virtually perpendicular. Posteriorly, the orbit communicates with the cranial cavity via the superior orbital fissure and with the pterygopalatine fossa via the … Continue reading Bony orbit

The cranial nerves II, III, IV Va and VI contribute to functions of the eye. Besides the optic nerve, the rest travel through the cavernous sinus and superior orbital fissure. CN II, IV and VI which provide motor control of the eye are often tested by having a patient tracing the letter “H” with their gaze. LR6SO4 (CN VI innervates lateral rectus, CN IV innervates … Continue reading Eye nerves: CN II, III, IV, Va & VI