<prompt> In case of Ptosis which cranial nerve will be completely paralyzed3rd CN palsy4th CN palsy5th CN palsy6th CN palsy  <response>: Ans. a 3rd CN palsyRef: A.K. Khurana 6th ed. 379 Ptosis is drooping of eyelid. Eyelid is comprised of 4 muscles:Muscles, their innervation and functionMuscleCN innervationFunctionLPSIIIOpens the eyelidMullers muscleIIIOpens eyelid when LPS tiredFrontalisVIICloses the eyelidOrbicularis oculiVIICloses the eyelid CN III palsy leads to drooping of eyelid Ptosis. CN VII palsy may also cause ptosis.Also Know All the extraocular muscles are supplied by CN III except lateral rectus and superior oblique. Lateral rectus supplied by- CN VI Superior oblique supplied by- CN IVRemember- LR6, S04; all other by CN III 