Triangular space

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Triangular space
Axillary space.png
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

The triangular space (also known as the medial triangular space,[1] upper triangular space,[2] or medial axillary space[citation needed] or foramen omotricipitale) is an axillary space.

It should not be confused with 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 or Subscapularis

For the superior border, some sources list the teres minor,[2][3] while others list the subscapularis.[4]


It contains the scapular circumflex vessels.[5]

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[edit]


  1. ^ Photo at
  2. ^ a b Kyung Won, PhD. Chung (2005). Gross Anatomy (Board Review). Hagerstown, MD: Lippincott Williams & Wilkins. p. 34. ISBN 0-7817-5309-0. 
  3. ^ Anatomy photo:03:05-0101 at the SUNY Downstate Medical Center - "Triangular Space of Scapular Region"
  4. ^ Adam Mitchell; Drake, Richard; Gray, Henry David; Wayne Vogl (2005). Gray's anatomy for students. Elsevier/Churchill Livingstone. ISBN 0-443-06612-4. 
  5. ^ Wasfi F, Ullah M (1985). "Structures passing through the triangular space of the human upper limb". Acta Anat (Basel). 123 (2): 112–3. doi:10.1159/000146049. PMID 4061026. 

External links[edit]