538 



MUSCLE-NERVE PHYSIOLOGY 



contraction represents irritation at the physiological anode. Since there are 

 physiological anodes and cathodes beneath each electrode, one or more of 

 four conditions may arise : 



1. Anodic closing contraction, i..e., the effect of the change developed at 

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



2. Anodic opening contraction, ie., 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 stronger 

 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. Medium currents. Strong currents* 



KCC KCC KCC 



ACC ACC 



AOC AOC 



KOC 



Sometimes AOC is stronger than ACC. 



r. nervi med. m. pron. ? 

 tereti. 



m. palmaris longus ~|-/ 



m. ulnaris int. 



n. ulnaris 



/ \ -l m. flex. dig. sublim. 



r. vol. prof. n. ulnar. 

 m. palmar brevis 

 m. abduc. dig. min. 

 m. flex. dig. min. 

 m. oppon. dig. min. -- 



mm. lumbr. II.,III.,IV. \-'-\ '--"-' 



m. radial. Intern. 



m. flex. dig. prof. 



U -- m. flex. poll. long. 

 m. medianus 



-X- m. abduc. poll. brev. 



L-. _. .A. m. oppon. poll. 



m. flex. poll. brev. 



. lumbric. I. 



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



