Magnified endoscopic view of right anterolateral pontine surface. Petrosal and clival bone have been removed to expose the anterolateral pons. The abducens nerve is shown ascending from the lower ventral pons through a remnant of clival dura. A portion of the anterior inferior cerebellar artery can be seen looping toward the internal auditory meatus in company with the facial and vestibulocochlear nerves. The trigeminal nerve emerges from the lateral pons and courses toward the petrous apex. Posterior and inferior to it is a portion of the vein of the middle cerebellar peduncle. (Image courtesy of AL Rhoton, Jr.)