ME.  J.  L.  CLAEKE  ON  THE  INTIMATE  STEHCTUEE  OF  THE  BEAIN. 
259 
PLATE  XVII. 
Fig.  34.  Part  of  the  raphe  of  the  human  medulla  oblongata.  It  is  traversed  from  before 
backwards  by  numerous  straight  fibres,  some  of  which  are  continuous  with 
fusiform  cells : — «'  are  bundles  from  the  deep  arciform  plexus  on  each  side, 
interspersed  with  cells  of  different  shapes,  and  decussating  through  the  raphe. 
Some  of  the  fibres  at  the  edge  of  the  raphe  form  loops  between  the  bundles ; 
b,  b are  longitudinal  fasciculi  of  the  antero-lateral  columns. 
Fig.  35.  Transverse  section  of  the  hypoglossal  nucleus,  if,  and  of  part  of  the  spinal- 
accessory  nucleus,  r,  of  the  Sheep ; 2:,  hypoglossal  nerve ; g'\  spinal-accessory 
nerve ; C,  central  canal ; K,  the  raphe. 
Fig.  37.  Cells  of  the  human  vagus  ganglion  magnified  420  diameters;  some  of  them  are 
pigmentary. 
For  explanation  of  fig.  36,  see  § 56,  page  254,  text. 
Figs.  38,  39,  40.  Left  halves  of  the  medulla  oblongata  of  Cercopithecus,  Semnopithecus, 
and  the  Wanderoo  Monkey : — a,  anterior  pyramid ; b,  olivary  body ; c,  tra~ 
pezium. 
Fig.  41.  Left  half  of  the  medulla  oblongata  of  TJrms  Syriacus: — c?,  arciform  fibres. 
