Leg
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A leg is the part of an animal's body that supports the rest of the animal above the ground betwean the ankle and the hip and is used for locomotion. The end of the leg furthest from the animal's body is often either modified or attached to another structure that is modified to disperse the animal's weight on the ground (see foot). In bipedal vertebrate animals, the two lower limbs are usually referred to as the 'legs' and the two upper limbs as the 'arms' or 'wings' as the case may be.
Legs typically come in even-numbered quantities. Many taxonomic groups are characterized by the number of legs its members possess.
- Uniped: 1
- Biped: 2
- Tripedal: 3
- Quadruped: 4
- Quinped: 5
- Arthropoda: 4, 6, 8, 12, or 14
- Some arthropods have more than a dozen legs; a few species possess over 100. Despite what their names might suggest,
- Centipedes typically have fewer than one hundred legs
- Millipedes have fewer than one thousand legs.
- Some arthropods have more than a dozen legs; a few species possess over 100. Despite what their names might suggest,
Evolution
The leg has evolved several times, most significantly among arthropods (crustaceans, insects, arachnids, et cetera) and vertebrates. In both cases, they are thought to have first evolved for locomotion underwater, then have been exploited for movement over land ever less desperate conditions as the generations passed.
The human leg
The bones of the human leg are:
See also
Sources
http://www2.merriam-webster.com/cgi-bin/mwmednlmcs:Noha pdc:Beh de:Untere Extremität et:Jalgeo:Gambo eu:Hanka fr:Membre inférieur humain ko:다리 (동물) it:Arto inferiore la:Crus lt:Apatinės galūnės nl:Been (ledemaat) ja:脚simple:Leg fi:Jalka sv:Ben (extremitet)
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .

