Flexion reflex

Japanese: 屈曲反射 - くっきょくはんしゃ(英語表記)flexion reflex
Flexion reflex
Also called the flexor reflex. A reflex in which the flexor muscles of a limb contract when the skin of the limb is stimulated strong enough to cause injury. One of the basic reflex forms of vertebrates with limbs. When a limb is stimulated, the flexor muscles contract reflexively through the pathway of sensory receptors - sensory nerves - spinal motor nerves - muscles. If the stimulus is strong, the reflex spreads to the entire flexor muscles of that limb, resulting in a coordinated flexion movement, with several joints all bending and folding toward the trunk. This reflex helps to escape harm, so it is also called an escape reflex, defensive reflex, or nociceptive reflex. In addition, because it is a reflex that begins in the receptors on the skin, it is also called a cutaneous reflex or extrinsic reflex.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
屈筋反射ともいう。四肢の皮膚を傷害を起すほど強く刺激したとき,その部位の屈筋が収縮する反射をいう。四肢をもつ脊椎動物の基本的な反射形式の一つ。四肢に刺激が与えられたとき,感覚受容器-感覚神経-脊髄運動神経-筋肉の経路によって,屈筋が反射的に収縮する。刺激が強ければ,反射はその肢の屈筋全体に広がって屈曲協同運動となり,いくつかの関節がすべて屈曲して,体幹に向って折りたたまれる。この反射は危害から逃れるのに役立つので,逃避反射,防御反射,侵害受容反射とも呼ばれる。また,皮膚にある受容器から始る反射なので,皮膚反射,外来反射などとも呼ばれる。

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