566 



WILL AND 



groups of Muscles in definite ways, with the effect of 

 producing the desired Movements. 



The mode in which physicians and pathologists have 

 acquired this knowledge as to the route followed by 

 cerebral stimuli from the Corpora Striata downwards to 

 the Muscles, is too intricate and technical to be here dis- 

 cussed. We must content ourselves for the present with 



the above simple 

 statement of facts, 

 in addition to the 

 following brief ex- 

 planation. 



The effects resulting 

 from disease of the Coi" 

 pora Striata in man, 

 whether in the form of 

 Softening or Hemor- 

 rhage, demonstrate the 

 importance of these 

 bodies in relation to 

 Yoluntary Movements, 

 and prove that they have 



Pio. 180.--mnsverse section of the Brain of a to do with the transmis- 

 Dog slightly in front of the Optic Commissure, SlOn and proper distribtl- 

 flhuwing the anterior part of the 'internal capsule,' tion of ' volitional ' inci- 

 the section of which on either side produces Hemi- ta tions. The destruction 

 pleg-ia. (Carville and Duret.) S, S, mtra-ventncular 



nuclei of the Corpus Striatum ; L, extra-ventricular or serious -damage of one 

 nucleus of the same ; P, peduncular expansion (' in- Corpus Striatum by 

 ternal capsule ) ; Ch, Optic Commissure ; x section ^ Q .^ Q produceg among 

 of the anterior part of the 'internal capsule,' pro- r 



ducing Hemiplegia of the opposite side of the body, other results, a complete 



loss of voluntary power 



over the Limbs on the opposite side of the body (Hemiplegia) 

 though the trunk muscles which are called into simultaneous ac- 

 tivity do not share in this paralysis, for reasons first given by 

 Broadbent (p. 480). Each Corpus Striatum transmits, therefore, 

 the ' volitional ' incitations for the Limb-movements of the oppo- 

 site half of the body; whilst it would appear that either of them 



