It then turns downwards, to emerge here at the stylomastoid foramen, just behind the root of the styloid process. The facial nerve passes backwards high in the medial wall of the tympanic cavity, above the oval window. To follow it we'll come round to the outside and look into the tympanic cavity. To represent the facial nerve we'll add this green wire to the picture.Įntering its canal the facial nerve passes forwards briefly, then makes an abrupt U-turn called the genu and passes backward. We've also unroofed a small part of the petrous temporal bone, here. To get a view of its course we've removed the front wall of the external auditory meatus along this line. In the facial canal, the facial nerve has a complex course in the temporal bone, passing round the wall of the tympanic cavity, and coming out behind the styloid process, here. ![]() The facial nerve passes forwards through this one, to enter its own bony tunnel, the facial canal. ![]() Here's the internal auditory meatus in the dry skull. Together they pass through this opening, the internal auditory meatus. This is the vestibulo-cochlear nerve, this is the facial nerve. Here are the facial and vestibulo-cochlear nerves. Here's the back of the petrous temporal bone. To follow them we'll look at a dissection of the posterior cranial fossa, in which the cerebellum has been removed. Here's the facial, here's the vestibulo-cochlear. As we've seen, these two nerves leave the brainstem just below the pons. We'll begin with the seventh and eighth, the facial and vestibulo-cochlear nerves. ![]() We'll move on now to look at cranial nerves seven through twelve.
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