THE TEGMENTUM AND THE PEDUNCLE OF THE MIDBHAIN. 



307 



flbrillse. The third ganglion mentioned {Deolcganglion) is filled with a net-work of 

 fine fibers. From this ganglion bundles pass ventrally between the two frontal 

 ganglia. An afferent bundle from the tegmentum of the midbrain ends in the two 

 pear-shaped ganglia. This bundle ia of large fibers, which remain intact after de- 

 struction of the cerebrum and the thalamus. 



Fig. 199 is a composite from several periods of development. In it 

 are shovm nearly all of the structures to be found in a section just posterior 

 to the anterior quadrigeminal bodies. 



Fig. 199. — Section just behind the anterior quadrigeminal bodies. A com- 

 posite from sections representing different stages of development of medullary 

 sheaths. HEematoxylin-copper-acetate method. (For Brach. C. quad. anf. read 

 post.] Tiefes Mark, Deep medullary stratum. Centr. HoMengrau, Central gray 

 matter. Aws Thalamus, From the thalamus. 



One may use this figure to review this chapter, finding the following 

 structures: — 



