1044 
terminating in the suleus calearinus from the 
fact, that its lips show as distinetly as the 
other part of the suleus in question a beautiful 
stripe of Vicq b’ Azyr. When using this argument 
we have introduced into our reasoning a new 
element of a microscopical, anatomical, and even, 
inay be, of a physiological nature. Many ana- 
tomists indeed regard ‘the region over which 
Figs 3. 
The same occipital lobe 
as fig. 2, seen frombehind; the above-mentiod stripe extends as the terminal 
shortenings as above. region of the centripetal, geniculo-occipital 
radiation, the recipient optic cortical-field (Visuosensory : CAMPBELL, 
Bouton, Morr a.0.). 
Apart from any physiological function and even from specific 
projeetion-combinations we may admit in man as irrefutable, that 
wheresoever the typical stria Vieq d’Azyr is found, we have to do 
with an area of a special character, which on account of its peculiar 
relations (in the greater majority of cases) to the limitations of the 
suleus calcarinus, may be characterised as regio calcarina. Area 
striata (Errror SMITH) area 17 (BRODMANN) and regio calcarina are 
consequently regarded in man as synonyms. My above mentioned 
conclusion that in reality the euneus-suleus terminating in the sulcus 
calcarinus must be regarded as a final branch of that suleus seems 
consequently not to be a hazardous assertion. 
As especially BRODMANN *) has taught us, the area striata (his area 
17) extends in the monkey over the lateral surface of the lob 
occipitalis (the operculum occipitale) as far as the monkey-slit. 
ErLior Situ stated the same fact in his Egyptians, be it over 
a more narrow strip of the region concerned, and he uses this fact 
as one of the arguments for homologising his sule. lunatus with the 
monkey-slit. This author conceives the connection between histolo- 
gically-characterised areas and brain-sulci a little schematically : very 
regularly he admits and represents the latter as limits of the former’). 
Apart from the fact that after the investigations of Brobmann, 
CAMPBELL a. Oo. his view cannot be maintained in this form, it 
postulates in the case discussed here a complete homology in the 
relation between the sulcus lunatus and the area striata in monkey 
and man. As appears from the phylogenesis of the sulci there is no 
complete parallelism between the evolution of the sulei and the 
relative migrations of the special cortical zones. . 
1) BropMANN: Vergleichende Lokalisationslehre der Grosshirnrinde. Leipzig 1909. 
2) Exuior SmrrH: A new topographical survey of the human cerebral cortex. 
Journ. of Anat. and Physiol, Vol. 4i. 
