Fig. 1

Endoscopic view of specimen (right ear), with view of tympanic and labyrinthine facial nerve and geniculate ganglion. Measurement is taken of exposed labyrinthine facial nerve after blue-lining of and prior to entry into the superior semicircular canal. et, Eustachian tube; cp, cochleariform process; fn, facial nerve; gg, geniculate ganglion; lc, lateral semicircular canal; sc, superior semicircular canal; mf, middle cranial fossa dura