Triangular space

The triangular space (also known as the medial triangular space, upper triangular space, medial axillary space or foramen omotricipitale) is one of the three spaces found at the axillary space. The other two spaces are the quadrangular space and the triangular interval.

It has the following boundaries:

• Inferior: the superior border of the teres major;
• Lateral: the long head of the triceps;
• Superior: Teres minor

For the superior border, some sources list the teres minor, while others list the subscapularis.

It contains the scapular circumflex vessels.

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

• Quadrangular space
• Triangular interval

• Diagram at microsurgeon.org
• Photo at tufts.edu
• Description at ganfyd.org^[usurped]
• Photo at ithaca.edu
• This article incorporates text in the public domain from page 445 of the 20th edition of Gray's Anatomy (1918)