412 THE BRAIN OF MAMMALS, BY TH. MEYNERT. 



racters presented by each of the cerebral ganglia in regard 

 to their form and structure, those connected with the crusta 

 and those with the tegmentum still exhibit certain features 

 in common, and hence the natural basis of division for the 

 ganglia rests upon the double nature of their peripheric con- 

 nection. The corpora geniculata (Kniehocker) alone, since 

 they do not stand in connection with the cms cerebri, occupy 

 an independent position as appendages of the ganglia of the 

 tegmentum. 



The ganglia of origin of the crusta of the cms cerebri are, 

 (1) the nucleus caudatus ; (2) the nucleus lenticularis ; and 

 (3) the substantia nigra of Soemmerring, between the crusta 

 and tegmentum of the cms cerebri. 



The caudate nucleus runs as art arch concentric to the 

 hemispheres around a transverse axis lying in the crus, an axis 

 which is physically embodied by the transverse wedge of the len- 

 ticular nucleus (corpus striatum externum), the base of which is 

 turned outwards, and the point inwards. This relation between 

 the two ganglia is displayed in fig. 243. The frontal segment of 

 the arch of the corpus striatum, lying in front of the lenticular 

 nucleus (Li, II, in) forms the large head (Nc), and the segment 

 belonging to the occipital and temporal lobes, the thin tail (No). 

 The transverse and arcuate ganglia of origin of the crusta of the 

 crus cerebri, moreover, coalesce at the frontal extremity of the 

 arch of the corpus striatum, by the junction, f the caput with 

 the third link of the lenticular nucleus (fig. 244, Nc' Lui), and 

 they also coalesce at the temporal extremity of this striated 

 arch (fig. 233, Cs ). In order to understand the anterior 

 coalescence, it must be borne in mind that the arch of the caput 

 of the corpus striatum curves over that surface of it which is 

 apparent in the lateral ventricle, downwards and outwards to 

 the basis of the cerebrum, and here forms, as the basal portion 

 of the caput, the grey substance above the lamina perforata an- 

 terior (fig. 238, Z). Gratiolet designates this mass the olfac- 

 tory area. I may be allowed to confirm anew the application of 

 this term, by showing that the basal substance of the corpus 

 striatum is invested by a thin layer of the cortex, the con- 

 tinuity of which, with the cortex of the olfactory lobe, may be 

 easily demonstrated in the prolongation of the neuroglia and 



