Triangular interval: Difference between revisions

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{{Use American English|date = January 2019}}

{{Infobox Anatomy |

{{Short description|Intermuscular space of the upper body}}

Name = Triangular interval |

{{Use mdy dates|date = January 2019}}

Latin = |

{{Infobox Anatomy |anatomy

GraySubject = |

| Name GrayPage = |Triangular interval

| Latin =
| Image = Triangular interval.PNG |

| Caption = Suprascapular and axillary nerves of right side, seen from behind. Triangular interval is labeled.) |

| Image2 = Gray524.png |

| Caption2 = The scapular and circumflex arteries. (Triangular interval is visible but not labeled.) |

| Precursor = |

| System = |

| Artery = |

| Vein = |

| Nerve = |

| Lymph = |

MeshName = |

MeshNumber = |

DorlandsPre = |

DorlandsSuf = |

}}

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]]. It is one of the three intermuscular spaces found in the [[axillary space]]. The other two spaces are: [[quadrangular space]] and [[triangular space]].<ref name="BD Chaurasia 2010">{{cite book|last1=Krishna|first1=Garg|title=BD Chaurasia's Human Anatomy (Regional and Applied Dissection and Clinical) Volume 1 - Upper limb and thorax|date=2010|publisher=CBS Publishers and Distributors Pvt Ltd|___location=India|isbn=978-81-239-1863-1|page=81|edition=Fifth|chapter=7 - Scapula}}</ref>

==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 |accessdateaccess-date=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.)

==Contents==

The contents of its borders are as follows:

The [[radial nerve]] and [[profunda brachii artery]] pass through the triangular interval, on their way to the [[posterior compartment of the arm]].

* [[Radial nerve]]

* [[Deep artery of arm|Profunda brachii]]

The [[radial nerve]] andis [[profunda brachii artery]] passvisible through the triangular interval, on theirits way to the [[posterior compartment of the arm]].

[[Deep artery of arm|Profunda brachii]] also passes through the triangular interval from anterior to posterior.

==Additional images==

<gallery>

ImageFile:Gray412-spaces.png|Muscles on the dorsum of the scapula, and the Tricepstriceps brachii.

</gallery>