CHAP. XXIII.] 



OF THE HUMAN BRAIN. 



431 



fibres which pass from the Spinal Cord into the Brain, 

 and vice versa. The laborious investigations of Stilling, 

 Lockhart Clarke, Meynert and others in regard to the 

 intimate structure of the Medulla, valuable as they are, 

 will be but little referred to here, because they have 

 revealed details far too 

 complex and technical to 

 be now set forth, and also 

 because a statement of 

 the general arrangement 

 of its principal parts will 

 be all that is really need- 

 ful for the carrying out of 

 our present plan. 



The intimate structure 

 and distribution of fibres 

 in higher parts of the 

 Brain is a study of no 

 less extreme difficulty, 

 which in recent years has 

 been dealt with principally 



, FIG. 152. Third and Fourth Ventricles of 



by Meynert, LuyS and the Brain exposed by removal of the 'velum 



"Rrrmrlhpnt flrmpprnino- interpositum ' and further cutting away of 



10 & Cerebral Hemispheres and portions of Cere- 



many points these Ob- bellum. (After Sharpey.) a, Corpus stria- 



/ i turn ; 6, Thalamus ; c. anterior pillars of 



servers are far from being Fornix : d> Foft or ,^ iddle con ; missure . 



in aCCOrd With One an- stretching across third ventricle ; e, Pineal 



, . . body; /, /, Corpora quadrigemina ; g, g, 



Otner. Ine VieWS OI superior Cerebellar Peduncle with (/;) part of 



Meynert On this difficult the 'valve of Vieussens' lying between them 



; and forming the roof of (4) the fourth ven- 



subject, have of late re- tricie. 

 ceived what they much 



needed in the way of re-arrangement and clearer exposi- 

 tion from Professor Huguenin of Zurich, and the value of 

 his work has been further enhanced in its French transla- 

 tion by the incorporation of new matter contributed by its 



