Im curious about this reflex. What does it affect? #1 - Does it causes the hand to open/close - if yes, why? #2 - Does will it flex either the tricep or the bicep? I've noted by pressing the the latereal cutaneous nerve with a thumb, which is close to the biceps brachii tendon the sameside leg buckles, the back bends forward along with the head. Can anyone explain this phenomen? Is it due to the crossed extensor reflex or something else? Reestablishing balance? Hope you can help.