Introduction Muscles of the EyeMuscleInnervationMajor FunctionSuperior rectusOculomotor nerve (CN III)Elevation and intorsionInferior rectusOculomotor nerve (CN III)Depression and extorsionLateral rectusAbducens nerve (CN VI)Abductionlateral movement of the eyeMedial rectusOculomotor nerve (CN III)Adductionmedial movement of the eyeSuperior obliqueTrochlear nerve (CN IV)Depression and intorsionInferior obliqueOculomotor nerve (CN III)Elevation and extorsion Cranial Nerve Palsies Oculomotor nerve palsy (3rd nerve palsy) results in paralysis of the innervated extraocular muscles therefore, the lateral rectus and superior oblique muscles are preserved login to view 4 more bullets etiologies compression login to view 7 more bullets vascular disease login to view 8 more bullets Trochlear nerve palsy (4th nerve palsy) results in paralysis of the superior oblique muscle, which normally intorts and depresses the eye results in hypertropia (eye elevation) and extorsion of the eye etiologies head trauma login to view 1 more bullet presentation head tilting away from the affected eye login to view 1 more bullet chin tucking and slightly looking upward login to view 1 more bullet Abducens nerve palsy (sixth nerve palsy) results in paralysis of the lateral rectus muscle, which normally abducts the eye etiologies increased intracranial pressure (e.g., intracranial tumors, pseudotumor cerebri, and hydrocephalus) login to view 2 more bullets presentation horizontal diplopia