Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . c conditions in order to exclude ex-tinction of excitability) current streamers easily produceon the long finger flexors or extensors a seeming interos-seal effect. Let the beginner be on the lookout for this,and always observe whether the first phalanx is actuallyflexed and the last two are extended. The muscles of the ball of the small finger (the oppo-nens, flexor, abductor digiti minimi muscles) are ex-cited at the root of the hypothenar. They produce theeffects expressed by their names, and are not alway
Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . c conditions in order to exclude ex-tinction of excitability) current streamers easily produceon the long finger flexors or extensors a seeming interos-seal effect. Let the beginner be on the lookout for this,and always observe whether the first phalanx is actuallyflexed and the last two are extended. The muscles of the ball of the small finger (the oppo-nens, flexor, abductor digiti minimi muscles) are ex-cited at the root of the hypothenar. They produce theeffects expressed by their names, and are not always tobe isolated. To test the muscles on the extensor side of the fore- * Since in paralysis of the interossei (ulnar paralysis) the antago-nists overbalance, overextension of the first and flexion of the lastphalanges occur (claw-hand). PLATE III. in. aeltoid (central I ItortiDii) \ m. biceps brachli a. bracliial. int. n. medianus ni. bracbioradial. ni. flex. carp. rad. in. flex. poUic, long. n. medianus m. oppon. poll. in. abduct, poll. brev. m. flex. poll. brev. m. abduct, J m. deltoid (anterior1 portion) n. musculocutaneus n. ulnaris m. pronator teres m. flexor carp. palmar, long. ,m. flex, digitor. sublim. n. ulnaris little flnger-ball muscles 72 ELECTBO-BIAGNOSm. they are very important muscles. The most excitablepoints lie on the dorsal side of the hand rather far proxi-mal (toward the shoulder) in the interosseal must at times exert some pressure on the electrodein order to excite them, and must exercise care thatthey are relaxed. Let the hand which is being examinedhang, with the palm down, over a rest, or let the physi-cian support it lightly with his own hand at the carpus;or allow it to rest with the palm on his own fingers,while the fingers of the patient hang loose, preferablyloosely separated from each other. Stimulation in everyinterosseal space causes: (1) approximation of bothfingers between which it lies; (2) flexion of their firstphala
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