脚 | 定義、骨、筋肉、事実 | ブリタニカ

Leg | Definition, Bones, Muscles, & Facts | Britannica Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos leg Introduction References & Edit History Related Topics Images Quizzes The Human Body Contents CITE verified Cite While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions. Select Citation Style MLA APA Chicago Manual of Style Copy Citation Share Share Share to social media Facebook X URL https://www.britannica.com/science/leg-anatomy Feedback External Websites Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article. External Websites Cleveland Clinic - Leg Muscle National Center for Biotechnology Information - PubMed Central - Muscle Architecture of Leg Muscles: Functional and Clinical Significance Hospital for Special Surgery - A Guide to Your Leg Muscles, from the Ground Up Innerbody - The Bones of the Leg and Foot OpenStax - Anatomy and Physiology 2e - Bones of the Lower Limb Healthline - Leg Anatomy PNAS - Leg length and bristle density, both necessary for water surface locomotion, are genetically correlated in water striders The Royal Society of Publishing - Biology Letters - The functions of leg muscles, structures and mechanisms in running Teach Me Anatomy - Muscles of the Leg Britannica Websites Articles from Britannica Encyclopedias for elementary and high school students. leg - Children's Encyclopedia (Ages 8-11) leg - Student Encyclopedia (Ages 11 and up) Muscles of the human hip, thigh, and lower leg Posterior view of the right leg, showing the muscles of the hip, thigh, and lower leg. (more) leg anatomy Ask Anything Homework Help Written and fact-checked by Britannica Editors Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Britannica Editors Last updated May 4, 2026 • History Britannica AI Ask Anything Table of Contents Table of Contents Ask Anything sciatic nerve Posterior view of the right leg, showing the sciatic nerve and its branches. (more) leg , limb or appendage of an animal , used to support the body, provide locomotion , and, in modified form, assist in capturing and eating prey (as in certain shellfish, spiders, and insects). In four-limbed vertebrates all four appendages are commonly called legs, but in bipedal animals, including humans, only the posterior or lower two are so called. The bones of the human leg, like those of other mammals, consist of a basal segment, the femur (thighbone); an intermediate segment, the tibia (shinbone) and the smaller fibula ; and a distal segment, the pes ( foot ), consisting of tarsals, metatarsals, and phalanges (toes). For the actions of the major muscles of the mammalian leg, see adductor muscle ; biceps muscle ; gastrocnemius muscle ; gluteus muscles ; quadriceps femoris muscle ; sartorius muscle ; soleus muscle . Related Topics: foot knee thigh heel ankle (Show more) On the Web: National Center for Biotechnology Information - PubMed Central - Muscle Architecture of Leg Muscles: Functional and Clinical Significance (May 04, 2026) (Show more) See all related content Britannica Quiz The Human Body In birds and bats the foreleg has evolved into the wing . Various other adaptations of the leg include modifications for swimming, digging, leaping, and running, as seen in the porpoise, the mole, the kangaroo, and the horse, respectively. The appendages of many invertebrates are also known as legs. The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Michele Metych .