63^ 



Physiology. — "On the nerve-distrllmtion in the tninh-dermatoma*\ 

 Bj Prof. G. VAN RiJNBERK. (Communicated by Prof. C. Winkler). 



{Communicated in the meeting of September 26, 1914). 



We know as a result from the researches on the segmental skin- 

 innervation, made after the method of the so called "remaining 

 aesthesia", first introduced by Sherrington, that from a definite 

 zone on the skin (the dermatoma or root-area) stimuli may reach 

 the spinal cord along each separate dorsal root of the spinal cord. 

 Sucii investigations, however, do not teach us anything about the 

 manner in which the sensibility in each of these root-areas is 

 provided for by the pei-ipherical cutaneous nerves. A few experi- 

 ments made on dogs have enabled me presently to offer the 

 following conclusions concerning exclusively the dermatomata of 

 the trunk. 



In a dissertation by 0. Nahrich '), written under the direction of 

 Ellenbf,rgkr, the nerves providing the skin of the dog are described 

 with elegant accuracy. It is shown therein, that the skin of the 





L.I. 



rf ^ "^ 



Tbd 



I - I- ' 



1 

 Th7 



Siti 



Fig. 1. Cutaneous nerves of the dog, according to Nahrich, — 01=Th. 1, first 

 thoracic nerve, dorsal branch, rl = first thoracic nerve, lateral branch, rl = Th. 3, 

 third thoracic nerve, ventral branch, ul = L. 1, first lumbar nerve, dorsal branch, 

 q = nerve of the large subcutaneous muscle. 



') 0. Nahrich. Die Gefiihlsbezirke und die niotorischen Punkte des Hundes. 

 Ein Beitrag zur vergl. Anatomie und Physiologic. Inaug. Diss. Zurich 1907, 



