A tail withdrawal procedure for assessing analgesic activity in rhesus monkeys.
Rhesus monkeys were restrained in chairs from which their tails hung free so that their tails could be immersed into a thermos of water. Monkeys consistently kept their tails in 38-40 degrees C water for at least 20 sec, but withdrew them from 55 degrees C water in 1-4 sec. Tail withdrawal latencies from 55 degrees C water remained consistent over a period of 3 hr. Morphine produced dose-dependent increases in tail withdrawal latencies from 55 degrees C water, whereas pentobarbital, haloperidol, and phencyclidine did not increase tail withdrawal latencies except at doses that produced marked sedation.
L A
LA
Dykstra
J H
JH
Woods
D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D004305:Dose-Response Relationship, Drug; D005260:Female; D006220:Haloperidol / Q000494:pharmacology; D006358:Hot Temperature / Q000009:adverse effects; D008297:Male; D009020:Morphine / Q000494:pharmacology; D010146:Pain / Q000188:drug therapy* / Q000209:etiology; D010424:Pentobarbital / Q000494:pharmacology; D010622:Phencyclidine / Q000494:pharmacology; D011930:Reaction Time / Q000187:drug effects
D000700:Analgesics; D009020:Morphine; D010424:Pentobarbital; D010622:Phencyclidine; D006220:Haloperidol