Anatomy. — "Once more tlie innervation and the tonus of the 

 striped muscles" . By Dr. J. G. Dcsseu de Barenne. (Commu- 

 nicated by Prof. J. Boeke) ^). 



(Communicated in the meeling of January 29, 1919). 



In continuation of a previous coniniunication '), to wiiicli 1 think 

 I niay refer by way of introduction, I want briefly to revert to 

 this question. 



In the first place to comnnmicate some further experimental facts 

 and in the second place to recall my criticism on a communication 

 by G. Mansfeld and A. LucaKs'), now that I have come to the 

 conclusion that the former is not sound. 



In that previous paper I have proved that S. de Boer's 0|)inion, 

 that the tonus of the striped muscles should be governed by 

 the sympathetic nervous system, is incorrect. That further 

 neither the cadaveric-rigidity, noi-, as has already been shown 

 by me*) before and has been confirmed by vanRunberk') since — 

 the decerebrate rigidity have anything to do with sympathetic inner- 

 vation. Only a slight, though clear hypotonus of the muscles of the 

 hindleg was perceptible with warm-blooded animals and frogs, after 

 unilateral resection of the abdominal sympatiietic. 



The result with my cats was that this symptom oidy disappeared 

 in the course of 5 to 8 weeks. So I thought I had better not 

 consider it a shock-phenomenon and as none of the other, in 

 my opinion plausible explanations were decisive "), I had to leave 



1) Tiie experiments communicated here, were partly performed by Mr. H. J. Havik, 

 med. stud, at Leiden, during my stay at Delft in the winter of 1917/1918. 



') Ueber die innervation und den Tonus der quergeslreiften Muskeln. Pfliiger's 

 Archiv, Band 166, 1916, p. 145. 



»} Untersuchungen iiber den chemischen Muskeltonus. 1. Pfliiger's Archiv, Band 

 161, 1915, p. 467. 



*) Ueber die Enthirnungsstarre (Decerebrate rigidity Sherrington's) in ilirer 

 Beziehung zur efferenten Innervation der quergeslreiften Muskulalur. Folia Neuro- 

 biologica. Band 7, 1913, p. 651. 



") Recherches sur Ie tonus musculaire el son innervation, II. tonus muscu'aire 

 et rigidité de décéiébratlon. Archives nééilandaises de physiologic de Thomme et 

 des animaux, tome I, 1917/1918, p. 726. 



6) Gf. for l.c (Pflüger's Archiv.), Bd. 166, p. 166 and 167. 



