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. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Borders 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). By TeachMeSeries Ltd (2025) Fig 1The borders of the triangular space. Contents 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. By TeachMeSeries Ltd (2025) Fig 2The circumflex scapular artery passes through the triangular space to enter the posterior scapular region. Do you think you’re ready? Take the quiz below Pro Feature - Quiz The Triangular Space Question 1 of 2 Submitting... Skip Next Rate question: You scored 0% Skipped: 0/2 1800 More Questions Available Upgrade to TeachMeAnatomy Pro Challenge yourself with over 1800 multiple-choice questions to reinforce learning Learn More Print Article Rate This Article