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 Cor- 

 pora Striata in man, 

 whether in the form of 

 Softening or Haemor- 

 rhage, demonstrate the 

 importance of these 

 bodies in relation to 

 Yoluntary Movements, 

 and prove that they have 

 to do with the transmis- 

 sion and proper distribu- 

 tion of ' volitional ' inci- 

 tations. The destrnctinn 

 or serious damage of one 

 Corpus Striatum by 

 disease produces, among 

 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 ]mralysis, for reasons first given by 

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

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

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



Fig. 180.— Transverse section of the Brain of a 

 Dog slightly in front of the Optic Commissure, 

 showing Ihe anterior part of the 'internal capsule,' 

 the section of which on either side produces Hemi- 

 plegria. (Oarville and Duret.) S, S, intra-ventricular 

 nuclei of the Corpus Striatum ; L, extra-ventricular 

 nucleus of the same ; P, peduncular expansion ■ 'in- 

 ternal capsule ') ; Ch, Optic Commissure ; x, section 

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

 ducing Hemiplegia of the opposite side of the body. 



