c.  Chorda  tympani, — This  nerve  takes  a  very  remarkable
course.  It  arises  at  an  acute  angle  fix)m  the  facial  about  ^  of  an
inch  before  its  exit  from  the  stylo-mastoid  foramen,  ascends  for  a
short  distance  in  a  bony  canal  at  the  back  of  the  tympanum,  and
enters  that  cavity  below  the  pyramid  and  close  to  the  membrana
tympani.  It  tlien  runs  forwards  through  the  tympanum,  across
the  handle  of  the  malleus,  to  the  fissura  Glaseri,  through  which  it
emerges  at  the  base  of  the  skull,  and  joining  the  gustatory  nervo
finally  proceeds  to  the  submaxillary  ganglion  (see  §  28,  a.)


DISSECTION  OF  THE  NOSE.
225.  Presuming  that  the  learner  is  familiar  with  the  bones  com-
poung  the  skeleton  of  the  nose,  we  shall  now  describe^] .  The
nasal  cartilages ;  2.  The  general  figure  and  arrangement  of  the
nasal  cavities ;  3.  The  membrane  which  lines  them ;  and  lastly,

*   Fbllopim  was  a  diitingiiihed  Italian  anatomiat,  and  professor  at
Patia.  1551.
02


284  CABTILAGES  07  THB  NOSE.
all  that  is  known  respecting  the   distribution   of  the  olfactoiy
nerves*

The  skin  of  the  nose  is  abundantly  supplied  with  sebaceous
glands ;  of  which  the  ducts  become  very  apparent  when  the  cuticle
is  removed.
226.  Cartilages  of  the  nose, — Two  pieces  of  fibro-cartilage  on
either  side  assist  in  forming  the  framework  of  the  external  nose ;
and  one  in  the  centre  completes  the  septum  between  the  nasal  fossae.
