﻿418 
  

  

  Dr. 
  D. 
  Ferrier 
  on 
  the 
  Brain 
  of 
  Monkeys. 
  

  

  VII. 
  a. 
  Clenching 
  of 
  the 
  fist. 
  

  

  The 
  whole 
  convolution 
  was 
  not 
  explored, 
  on 
  account 
  of 
  constant 
  

   repetition 
  of 
  choreic-like 
  spasms. 
  

  

  VIII. 
  a. 
  Flexion 
  of 
  the 
  fingers, 
  passing 
  into 
  firm 
  closure 
  of 
  the 
  

   whole 
  fist. 
  

  

  This 
  action, 
  slowly 
  performed, 
  began 
  with 
  the 
  thumb, 
  which 
  

   became 
  adducted, 
  then 
  the 
  index-finger, 
  the 
  fiugers 
  in 
  succession 
  

   becoming 
  adducted 
  and 
  then 
  flexed 
  till 
  the 
  fist 
  became 
  firmly 
  

   closed. 
  

  

  b. 
  Flexion 
  and 
  adduction 
  of 
  the 
  thumb 
  alone. 
  

  

  c. 
  First 
  adduction 
  and 
  flexion 
  of 
  the 
  thumb, 
  then 
  firm 
  closure 
  

   of 
  the 
  fist 
  and 
  pronation 
  of 
  the 
  arm. 
  

  

  IX. 
  a, 
  b, 
  c, 
  d. 
  Slight 
  touch 
  causes 
  adduction 
  of 
  the 
  thumb, 
  followed 
  on 
  

   longer 
  stimulation 
  by 
  flexion 
  of 
  the 
  fingers 
  and 
  complete 
  closure 
  

   of 
  the 
  fist. 
  

  

  Stimulation 
  close 
  to 
  the 
  fissure 
  of 
  Rolando 
  caused 
  the 
  same 
  

   movements, 
  and 
  also 
  very 
  decided 
  extension 
  of 
  the 
  wrist 
  when 
  the 
  

   fist 
  was 
  completely 
  closed. 
  

  

  X. 
  Not 
  explored. 
  

  

  XI. 
  Eesults 
  essentially 
  similar 
  to 
  IX. 
  

  

  XII. 
  ]Sot 
  explored. 
  

  

  XIII. 
  Clenching 
  of 
  the 
  fist 
  as 
  in 
  former 
  experiments. 
  

  

  The 
  variations 
  described 
  in 
  the 
  movements 
  resulting 
  from 
  stimulation 
  

   of 
  the 
  ascending 
  parietal 
  convolution 
  are 
  apparently 
  all 
  referable 
  to 
  dif- 
  

   ferent 
  aspects 
  of 
  combined 
  muscular 
  contractions, 
  which 
  in 
  their 
  com- 
  

   pletest 
  action 
  serve 
  to 
  cause 
  closure 
  of 
  the 
  fist 
  or 
  the 
  grasping-action 
  of 
  

   the 
  hand. 
  Centres 
  for 
  the 
  extensors 
  and 
  flexors, 
  or 
  for 
  the 
  flexors 
  and 
  

   extensors, 
  of 
  the 
  individual 
  digits 
  could 
  not 
  be 
  definitely 
  made 
  out. 
  

  

  Owing 
  to 
  the 
  proximity 
  of 
  the 
  centre 
  for 
  the 
  platysma 
  (circle 
  (ll)) 
  

  

  at 
  the 
  lower 
  end 
  of 
  the 
  ascending 
  parietal, 
  very 
  frequently, 
  along 
  with 
  

   firm 
  closure 
  of 
  the 
  fist, 
  there 
  was 
  decided 
  retraction 
  of 
  the 
  angle 
  of 
  the 
  

   mouth 
  on 
  the 
  same 
  side. 
  

  

  Ascending 
  frontal 
  convolution 
  : 
  — 
  

  

  Circle 
  (^^)-> 
  n 
  g 
  s 
  * 
  I 
  & 
  The 
  position 
  of 
  this 
  is 
  on 
  a 
  level 
  with 
  the 
  

  

  posterior 
  extremity 
  of 
  the 
  middle 
  frontal 
  convolution. 
  

  

  I. 
  Supination 
  of 
  the 
  hand 
  and 
  flexion 
  of 
  the 
  forearm 
  on 
  the 
  humerus, 
  

   the 
  hand 
  being 
  also 
  more 
  or 
  less 
  clenched. 
  The 
  action 
  is 
  such 
  as 
  

   may 
  be 
  attributed 
  to 
  the 
  biceps, 
  along 
  with 
  action 
  of 
  the 
  flexors 
  

   of 
  the 
  fingers. 
  

  

  Long-continued 
  stimulation 
  brings 
  the 
  hand 
  up 
  to 
  the 
  mouth, 
  

   and 
  at 
  the 
  same 
  time 
  the 
  angle 
  of 
  the 
  mouth 
  is 
  retracted 
  and 
  

   elevated. 
  

  

  