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(a) Sites for painful stimulus: supra-orbital region, finger nail bed (b) Tests carried for nerve examination, corneal reflex (afferent V efferent VII), pupils dilated (II and III), caloric test (efferent VIII and efferent VI), cough reflex (afferent IX and efferent X), (c) Apnea test, (d) Apnea test with the help of positive end-expiratory pressure valve
