﻿422 
  

  

  Dr. 
  D. 
  Ferrier 
  on 
  the 
  Brain 
  of 
  Monkeys. 
  

  

  These 
  results 
  point 
  very 
  definitely 
  to 
  a 
  centre 
  for 
  the 
  movements 
  o£ 
  

   the 
  mouth 
  and 
  tongue, 
  the 
  muscles 
  concerned 
  in 
  mastication 
  and 
  also 
  in 
  

   articulation. 
  Its 
  position 
  is 
  significant, 
  as 
  being 
  the 
  homologue 
  in 
  man 
  

   of 
  that 
  region 
  which 
  is 
  the 
  seat 
  of 
  lesion 
  in 
  the 
  disease 
  known 
  as 
  aphasia, 
  

   described 
  as 
  the 
  posterior 
  extremity 
  of 
  the 
  lower 
  frontal 
  convolution. 
  

   (In 
  aphasia 
  the 
  lesion 
  is 
  generally 
  on 
  the 
  left 
  side, 
  but 
  the 
  bilateral 
  move- 
  

   ments 
  are 
  seen 
  by 
  the 
  experiments 
  to 
  be 
  induced 
  from 
  both 
  right 
  and 
  

   left 
  sides.) 
  

  

  Circle 
  D 
  g 
  s 
  - 
  1 
  & 
  2, 
  corresponding 
  to 
  the 
  lower 
  termination 
  of 
  

  

  the 
  ascending 
  parietal 
  convolution 
  and 
  region 
  of 
  the 
  inferior 
  termination 
  

   of 
  the 
  intraparietal 
  sulcus 
  (the 
  conjoint 
  extremities 
  of 
  the 
  ascending 
  

   parietal 
  and 
  angular 
  gyrus). 
  

  

  I. 
  Eetraction 
  of 
  the 
  right 
  angle 
  of 
  the 
  mouth, 
  apparently 
  the 
  platysma 
  

  

  thrown 
  into 
  action. 
  

  

  The 
  effect 
  was 
  kept 
  up 
  after 
  stimulation 
  in 
  a 
  spasmodic 
  

   manner. 
  

  

  II. 
  Not 
  explored. 
  

  

  III. 
  Eight 
  angle 
  of 
  the 
  mouth 
  retracted. 
  The 
  head 
  becomes 
  drawn 
  

   to 
  the 
  right 
  by 
  powerful 
  contraction 
  of 
  the 
  platysma. 
  

  

  IV. 
  Not 
  explored. 
  

  

  V. 
  Eetraction 
  of 
  the 
  right 
  angle 
  of 
  the 
  mouth. 
  

  

  VI. 
  Not 
  explored. 
  

  

  VII. 
  Not 
  explored. 
  

  

  VIII. 
  Eetraction, 
  with 
  some 
  appearance 
  of 
  elevation 
  of 
  the 
  right 
  

   angle 
  of 
  the 
  mouth, 
  along 
  with 
  powerful 
  contraction 
  of 
  the 
  

   subcutaneous 
  muscles 
  on 
  the 
  right 
  side 
  of 
  the 
  neck, 
  evidently 
  

   the 
  platysma. 
  

  

  IX. 
  Eetraction 
  of 
  the 
  left 
  angle 
  of 
  the 
  mouth. 
  In 
  this 
  case 
  the 
  

   mouth 
  was 
  partially 
  opened 
  so 
  as 
  to 
  expose 
  the 
  teeth. 
  

  

  X. 
  Eetraction 
  of 
  the 
  left 
  angle 
  of 
  the 
  mouth. 
  

  

  This 
  point 
  was 
  explored 
  after 
  several 
  other 
  regions 
  had 
  been 
  

   under 
  stimulation. 
  The 
  application 
  of 
  the 
  electrodes 
  to 
  this 
  point 
  

   gave 
  rise 
  to 
  spasms 
  of 
  a 
  choreic 
  or 
  epileptiform 
  nature, 
  beginning 
  

   in 
  the 
  left 
  angle 
  of 
  the 
  mouth, 
  then 
  affecting 
  the 
  left 
  hand 
  and 
  

   arm, 
  and 
  lastly 
  the 
  left 
  leg 
  and 
  tail. 
  The 
  choreic 
  spasms 
  then 
  

   passed 
  to 
  the 
  right 
  angle 
  of 
  the 
  mouth, 
  the 
  right 
  hand 
  and 
  arm, 
  

   and 
  in 
  a 
  slight 
  degree 
  to 
  the 
  right 
  leg 
  and 
  tail. 
  

  

  The 
  fit 
  lasted 
  one 
  or 
  two 
  minutes. 
  It 
  had 
  not 
  all 
  the 
  characters 
  

   of 
  a 
  fully 
  pronounced 
  epileptic 
  attack. 
  

  

  XI. 
  Eetraction 
  of 
  the 
  right 
  angle 
  of 
  the 
  mouth. 
  Eecorded 
  as 
  action 
  

   of 
  the 
  platysma. 
  

  

  XII. 
  Not 
  explored. 
  

  

  