# Triangular space

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Triangular_space
> Markdown URL: https://mediated.wiki/source/Triangular_space.md
> Source: https://en.wikipedia.org/wiki/Triangular_space
> Source revision: 1322268639
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Anatomical region of the shoulder joint

Triangular space Suprascapular and axillary nerves of right side, seen from behind. The axillary spaces are labeled in green. Triangular space is the medial space. The scapular and circumflex arteries. (Triangular space is visible but not labeled.) Anatomical terminology [edit on Wikidata]

The **triangular space** (also known as the **medial triangular space**,[1] **upper triangular space**,[2] medial axillary space or foramen omotricipitale[3]) is one of the three spaces found at the [axillary space](/source/Axillary_space). The other two spaces are the [quadrangular space](/source/Quadrangular_space) and the [triangular interval](/source/Triangular_interval).[4]

## Boundaries

It has the following boundaries:

- Inferior: the superior border of the [teres major](/source/Teres_major);

- Lateral: the long head of the [triceps](/source/Triceps);

- Superior: Teres minor

For the superior border, some sources list the [teres minor](/source/Teres_minor),[2][5] while others list the [subscapularis](/source/Subscapularis).[6]

## Contents

It contains the [scapular circumflex](/source/Scapular_circumflex) vessels.[7]

Unlike the quadrangular space or the triangular interval, no major nerve passes through the triangular space.

Muscles on the dorsum of the scapula, and the triceps brachii.

## See also

- [Quadrangular space](/source/Quadrangular_space)

- [Triangular interval](/source/Triangular_interval)

## References

1. **[^](#cite_ref-1)** [Photo at tufts.edu](http://iris3.med.tufts.edu/dentgross/labguide/Shoulder4.html)

1. ^ [***a***](#cite_ref-isbn0-7817-5309-0_2-0) [***b***](#cite_ref-isbn0-7817-5309-0_2-1) Kyung Won, PhD. Chung (2005). *Gross Anatomy (Board Review)*. Hagerstown, MD: Lippincott Williams & Wilkins. p. 34. [ISBN](/source/ISBN_(identifier)) [0-7817-5309-0](https://en.wikipedia.org/wiki/Special:BookSources/0-7817-5309-0).

1. **[^](#cite_ref-Fermin_2015_3-0)** Valera Garrido, Fermin (October 2, 2015). [*Advanced Techniques in Musculoskeletal Medicine and Physiotherapy: Using Minimally Invasive Therapies in Practice*](https://books.google.com/books?id=Yg3hCgAAQBAJ&pg=PA113). Elsevier Health Sciences. p. 113. [ISBN](/source/ISBN_(identifier)) [9780702062346](https://en.wikipedia.org/wiki/Special:BookSources/9780702062346). Retrieved January 26, 2018.

1. **[^](#cite_ref-BD_Chaurasia_2010_4-0)** Krishna, Garg (2010). "7 - Scapula". *BD Chaurasia's Human Anatomy (Regional and Applied Dissection and Clinical) Volume 1 - Upper limb and thorax* (Fifth ed.). India: CBS Publishers and Distributors Pvt Ltd. pp. 81, 82. [ISBN](/source/ISBN_(identifier)) [978-81-239-1863-1](https://en.wikipedia.org/wiki/Special:BookSources/978-81-239-1863-1).

1. **[^](#cite_ref-5)** [Anatomy photo:03:05-0101](http://ect.downstate.edu/courseware/haonline/labs/l03/050101.htm) at the SUNY Downstate Medical Center - "Triangular Space of Scapular Region"

1. **[^](#cite_ref-isbn0-443-06612-4_6-0)** Adam Mitchell; Drake, Richard; Gray, Henry David; Wayne Vogl (2005). *Gray's anatomy for students*. Elsevier/Churchill Livingstone. [ISBN](/source/ISBN_(identifier)) [0-443-06612-4](https://en.wikipedia.org/wiki/Special:BookSources/0-443-06612-4).

1. **[^](#cite_ref-7)** Wasfi F, Ullah M (1985). "Structures passing through the triangular space of the human upper limb". *Acta Anat (Basel)*. **123** (2): 112–3. [doi](/source/Doi_(identifier)):[10.1159/000146049](https://doi.org/10.1159%2F000146049). [PMID](/source/PMID_(identifier)) [4061026](https://pubmed.ncbi.nlm.nih.gov/4061026).

## External links

- [Diagram at microsurgeon.org](http://www.microsurgeon.org/back_muscles_parascap.jpg)

- [Photo at tufts.edu](http://iris3.med.tufts.edu/dentgross/labguide/Shoulder4.html)

- [Description at ganfyd.org](https://web.archive.org/web/20070927205309/http://www.ganfyd.org/index.php?title=Triangular_space)

- [Photo at ithaca.edu](http://www.ithaca.edu/faculty/lahr/LE2000/UE_Ind_Study_99/shoulder/edited/superficial_post.jpeg)

- *This article incorporates text in the [public domain](/source/Public_domain) from [page 445](https://archive.org/stream/anatomyofhumanbo1918gray#page/445/mode/2up) of the 20th edition of* [Gray's Anatomy](/source/Gray's_Anatomy) *(1918)*

v t e Muscles of the arm Shoulder deltoid rotator cuff supraspinatus infraspinatus teres minor subscapularis teres major fascia: deltoid fascia supraspinous fascia infraspinous fascia Arm (compartments) anterior coracobrachialis biceps brachialis posterior triceps brachii anconeus articularis cubiti fascia axillary sheath axillary fascia brachial fascia intermuscular septa lateral medial other spaces quadrangular space triangular space triangular interval Forearm (compartments) anterior superficial: pronator teres palmaris longus flexor carpi radialis flexor carpi ulnaris flexor digitorum superficialis deep: pronator quadratus flexor digitorum profundus flexor pollicis longus posterior superficial: mobile wad brachioradialis extensor carpi radialis longus and brevis extensor digitorum extensor digiti minimi extensor carpi ulnaris deep: supinator anatomical snuffbox abductor pollicis longus extensor pollicis brevis extensor pollicis longus extensor indicis fascia bicipital aponeurosis common tendons extensor flexor antebrachial fascia other cubital tunnel osborne's ligament Hand lateral volar thenar opponens pollicis flexor pollicis brevis abductor pollicis brevis adductor pollicis medial volar hypothenar opponens digiti minimi flexor digiti minimi brevis abductor digiti minimi palmaris brevis intermediate lumbrical interossei dorsal palmar fascia posterior: extensor retinaculum extensor expansion anterior: flexor retinaculum palmar aponeurosis

This anatomy article is a stub. You can help Wikipedia by adding missing information.

- [v](https://en.wikipedia.org/wiki/Template:Anatomy-stub)
- [t](/source/Template_talk%3AAnatomy-stub)
- [e](https://en.wikipedia.org/wiki/Special:EditPage/Template:Anatomy-stub)

[Portal](https://en.wikipedia.org/wiki/Wikipedia:Contents/Portals):
- [Anatomy](https://en.wikipedia.org/wiki/Portal:Anatomy)

---
Adapted from the Wikipedia article [Triangular space](https://en.wikipedia.org/wiki/Triangular_space) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Triangular_space?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.