192 OF MUSCULAR MOTION. 



correspond which have been so frequently made by 

 dividing or tying the nerves.* Paralysis ensued, but 

 irritability continued vigorous for a length of time 

 afterwards. 



There have been cases where one limb was motion- 

 less from paralysis but retained its sensibility, while 

 the other was insensible but still capable of motion .f 

 Some persons have had great pain in paralytic parts. ^ 



305. The true efficacy of the blood, so copiously 

 afforded to muscles, (296) in promoting their action, 

 is not clearly ascertained. 



In the Stenonian experiment, § indeed, paralysis of 

 the hind legs commonly follows the application of a 

 ligature upon the abdominal aorta. || (D) 



But after all, we are confirmed in the opinion formerly 

 mentioned (125), — that the action of what are com- 

 monly called voluntary muscles depends less than 

 that of the heart upon the afflux of blood to the 

 moving fibres; and on the contrary, more than it, 

 upon the influence of the nerves which excite their 

 irritability. 



306. Besides these inherent powers common to all 

 muscles, there are some peculiar and adventitious, 

 arising from figure, situation, &c. and answering their 

 object with perfect accuracy. 



• J. H. v. Brunn, Erperimenta circa Ligaturat Nervorum in vivis anbua- 

 libtu instituta. Gotting. 1753. 4to. 



T v. J. Stewart, Ue Systematis Xervosi Officiu. Edinb. 8vo. 



X C. H. Pfaff, fiber Thierischc Elektricitut und Reizbarkeit. Leipzig. 

 1795. 8vo. p. 263. 



§ Stem mis, Element or. Myologitc *pec. Florent. 1667. 4to. p. 86. 



|| Sec Courtcn, P kilos. Trans. No. 335. p. 500;' and Haller, Comment. Sot. 

 Si. Gotting. T. iv. p. 293. 



