Appendage

Japanese: 付属肢 - ふぞくし（英語表記）appendage

An appendage, such as a leg, that protrudes from an animal's body. The verrucas of annelids (such as lugworms) are found on almost every body segment and are considered to be the prototype of appendages. In tardigrades and other animals, they develop into clawed feet with hooks at the end, and in arthropods, they become articulated limbs with joints. However, some body segments lack appendages, and only certain appendages develop or change in particular to become fully functional, such as walking or holding. Antennae and mouthparts are also modified appendages. In vertebrates, they are called appendages, and are broadly divided into median limbs in the center of the body and paired limbs on the left and right, including the fins of fish.

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

Japanese:

動物の体から突出する，いわゆる脚などの付属物。環形動物 (ゴカイなど) の疣足 (いぼあし) は，ほぼ各体節ごとにみられ，付属肢の原型的なものと考えられる。クマムシなどでは，先端に鉤をもつ爪足へと発達し，節足動物では関節をもつ関節肢となる一方，付属肢を欠く体節も生じ，またある付属肢だけが特に発達したり変形したりして，歩行，保持などの機能に関して完成してくる。触角，口器なども付属肢の変形である。脊椎動物では外肢といい，魚類の鰭も含めて，体の中央にある正中肢と，左右に対をなす有対肢に大別される。

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