Editing Arm (section)

===Muscles===
The arm is divided by a [[fascia]]l layer (known as lateral and medial [[lateral intermuscular septum of arm|intermuscular septa]]) separating the muscles into two ''osteofascial compartments'': the [[Anterior compartment of the arm|anterior]] and the [[Posterior compartment of the arm|posterior compartments of the arm]]. The fascia merges with the [[periosteum]] (outer bone layer) of the humerus.<ref name=":0">{{Cite book|title=Gray's anatomy for students|last=Drake, Richard L. (Richard Lee)|others=Vogl, Wayne; Mitchell, Adam W. M.; Gray, Henry|date=15 November 2015|isbn=9780702051319|edition=  Third|location=Philadelphia, PA|oclc=881508489}}</ref>

The anterior compartment contains three muscles: [[Biceps|biceps brachii]], [[brachialis]] and [[Coracobrachialis muscle|coracobrachialis]] muscles. They are all innervated by the [[musculocutaneous nerve]]. The posterior compartment contains only the [[Triceps|triceps brachii muscle]], supplied by the [[radial nerve]].<ref>{{Cite book|title=Clinically oriented anatomy|last=Moore, Keith L.|others=Dalley, Arthur F., II,, Agur, A. M. R.|isbn=978-1451119459|edition=  Seventh|location=Philadelphia|oclc=813301028|date = 2013-02-13}}</ref><ref>{{Cite book|title=Gray's anatomy : the anatomical basis of clinical practice|editor=Standring, Susan|year=2016|isbn=9780702052309|edition=  Forty-first |location=[Philadelphia]|oclc=920806541}}</ref><ref>{{Cite web|url=https://www.kenhub.com/en/library/anatomy/elbow-and-forearm|title=Elbow and Forearm|website=Kenhub|access-date=2019-09-14}}</ref>