The Triangular Space

Written by Oliver Jones

Last updated July 20, 2023 • 11 Revisions •

The triangular space is an anatomical space located in the axilla.

It allows structures to pass between the axilla and posterior scapular region.

In this article, we shall look at the anatomy of the triangular space – its borders, contents and clinical correlations.

Note: This area should not be confused with the triangular interval, which lies inferiorly to the triangular space, and is discussed here.

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The triangular space is orientated with the base laterally and apex medially. It has three borders:

  • Lateral – medial margin of the long head of the triceps brachii.
  • Inferior – superior margin of the teres major.
  • Superior – inferior border of the teres minor (or subscapularis).

Fig 1
The borders of the triangular space.


The triangular space is a passageway that allows structures to travel between the axilla and posterior scapular region.

It contains the circumflex scapular artery and vein.

Fig 2
The circumflex scapular artery passes through the triangular space to enter the posterior scapular region.


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