<prompt> Which of the following nerve is first affected in berry aneurysm:3 rd nerve4th nerve5th nerve6th nerve  <response>: Ans.a 3rd nerveRef: Harrison 19th ed. 1784-85 Most common cranial nerve affected in unruptured berry aneurysm is the 3rd cranial nerve which will present as ipsilateral ptosis, diplopia and strabismus. 