Editing Upper limb (section)

==Definition==
In formal usage, the term "arm" only refers to the structures from the shoulder to the elbow, explicitly excluding the [[forearm]], and thus "upper limb" and "arm" are not synonymous.<ref>{{cite web
 | title = Arm
 | publisher = MeSH
 | url = https://www.nlm.nih.gov/cgi/mesh/2011/MB_cgi?mode=&term=ARM
 | access-date = 26 June 2011
}}</ref> However, in casual usage, the terms are often used interchangeably. The term "upper arm" is redundant in anatomy, but in informal usage is used to distinguish between the two terms.