(From the same). The passage that conveys the air to the auditory nerve. It leads from the lower anterior part of the concha to the tympanum, and is partly bony, partly cartilaginous; all within the temporal bone is the bony part, it is the longest, and forms the bottom; the rest is cartilaginous, and makes the external opening or orifice of the canal: these two parts make a canal of about three fourths of an inch long, a little tortuous, and wider in some parts than in others. On the membranous covering of the cartilaginous part we observe the yellow bodies, supposed to be the glandule ceruminis. The bony part of the meatus is nearly horizontal and straight; the cartilaginous part only is curved and winding, which should be observed when a syringe is used to inject any thing with into the ear.

Auditorius nervus. The auditory nerve. The seventh pair of nerves are called auditory nerves; so are the sympathetici minores. This seventh pair of nerves run into the os petrosum, and are there divided into the portio mollis, which is spent upon the labyrinth of the ear, and distributed to_ the meatus auditorius in-lernus, passing to the vestribulum cochleae; and portio dura, which goes out by the aqueduct, between the mastoid and styloid processus, passes through the parotid, becomes a cutaneous nerve, and communicates with the upper maxillary. On these nerves, no covering from the dura mater can be traced.