( 268 ) 
4—1) and the question arises whether the root-bundles, whose com- 
mon area of innervation is the dermatoma, do not possess as just a 
claim to be called unities. At any rate we desire to know how each 
root-bundle separately behaves itself in reference to the whole of the 
dermatoma, the more so now one of us!) has demonstrated that 
clinical experience demands a still further analysis of the dermato- 
mata. The question whether a separate area of innervation within 
the dermatoma ought to be attributed to each root-bundle, and if so, 
whether these area’s of root-bundles ought to be ranged therein 
eranio-caudally or dorso-ventrally, has to be solved experimentally. 
For this reason there have been made in the laboratory for neuro- 
logy at Amsterdam, a great number of experiments on dogs, in view 
of solving this question for the trunk-dermatomata of that species. 
First of all we must observe that the form of the trunk-dermatoma, 
as it has been deduced from the experiments of TURCK and SHERRINGTON, 
and from the dissections of Bork ought to remind one of a trapezium 
stretched longitudinally. Because the dorsal part of the trunk from the 
Ist to the 12% vertebra of the chest, is much shorter than that 
part of the trunk situated ventrally between manubrium sterni and 
symphysis pubis, the base of the trapezium lying adjacent to the 
mid-ventral-line must be stretched and thus made longer than the 
side lying adjacent to the mid-dorsal-line. 
Ideal form of the (arched) dermatoma, between two (dotted) insensible area's”). 
IC. Winkuer. Feestbundel Dr. Sape TALMA aangeboden. Klinische bijdragen tot 
de kennis der wortelinnervatie van de huid. 
2) In all these figures arbitrary demarcation-lines have been traced, limiting the 
sensible area above and below. The exact situation of these demarecations will occupy 
us further on. 
