474 



MUSCLE-NERVE PHYSIOLOGY 



2. Anodic opening contraction, i.e., the effect of the change developed at 

 the physiological anode, beneath the physical anode (positive pole). 



3. Cathodic closing contraction, i.e., the effect of the change developed 

 at the physiological cathode, beneath the physical cathode (negative pole). 



4. Cathodic opening contraction, i.e., the effect of the change developed 

 at the physiological anode, beneath the physical cathode (negative pole). 



The following abbreviations of these contractions are used: ACC, AOC, 

 KCC, KOC. 



The closing contractions, KCC and ACC, are stronger than the opening 

 contractions, KOC and AOC. Of the closing contractions, KCC is strong- 

 er than ACC. Of the opening contractions, AOC is stronger than KOC. 

 These facts are also shown in a table of the effects of gradually increasing the 

 strength of the current. 



Weak Currents. 

 KCC 



Medium Currents. 

 KCC 

 ACC 

 AOC 



Strong Currents. 

 KCC 

 ACC 

 AOC 

 KOC 



Sometimes AOC is stronger than ACC. 



In diseases which cause degeneration of the nerves going to a muscle, 

 stimulation causes results different from the above, and we get what is known 

 as the reaction of degeneration. 



r. nervl med. m. pron. 

 tereti. 



m. palmaris longus 



m. ulnarls Int. 



n. ulnaris 



r. vol. prof. n. ulnar. 

 m. palmar brevis 

 m. abduc. dig. min. 

 m. flex. dig. min. 

 m. oppon. dig. min. 



mm, Uimbr. II.,III.,IV. 



m. radial. Intern, 

 m. flex. dig. prof. 



m. flex. dig. sublim. 



m. flex. poll. long, 

 m. medianus 



- -S^ m. abduc. poll. brey. 



.7 L'. .A m. oppon. poll. 



m. flex. poll. brev. 

 m. adduc. poll. 

 - m. lumbric. I. 



FIG. 336. Figure Showing Motor Points in the Forearm. 



