The training course of the portion will not be specifically a straight line, curving initial a little up and also to the back again initially, ahead of bending forward and down. The internal part—representing about two-thirds of its system—is surrounded by temporal bone and terminates at the tympanic membrane (see http://jacquesf692gew2.bloggerswise.com/8842995/the-fact-about-ear-problems-prevention-that-no-one-is-suggesting