The '''triangular interval''' (also known as the '''lateral triangular space''',<ref>[http://iris3.med.tufts.edu/dentgross/labguide/Shoulder4.html Photo at tufts.edu]</ref> '''lower triangular space''',<ref name="isbn0-7817-5309-0">{{cite book |author=Kyung Won, PhD. Chung |title=Gross Anatomy (Board Review) |publisher=Lippincott Williams & Wilkins |___location=Hagerstown, MD |year=2005 |pages=34 |isbn=0-7817-5309-0 |oclc= |doi=}}</ref> and '''triceps hiatus''') is a space found in the [[axilla]].
==Borders==
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* long head of the [[triceps brachii]] - medial
Some sources state the lateral border is the [[humerus]],<ref>{{cite book |authorauthor1=Adam Mitchell; |author2=Drake, Richard; |author3=Gray, Henry David; |author4=Wayne Vogl |title=Gray's anatomy for students |publisher=Elsevier/Churchill Livingstone |___location= |year=2005 |pages=650 |isbn=0-443-06612-4 |oclc= |doi=}}</ref><ref name="title">{{cite web |url=http://anatomy.uams.edu/anatomyhtml/topogr_back.html |title=uams.edu |accessdate=2008-01-02 |work=}}</ref> while others define it as the lateral head of the triceps.<ref name="isbn0-7817-5309-0"/> (The effective difference is relatively minor, though.)
