Triangular space

Triangular space is a region in the axilla, or armpit area, of the human body. It is one of three spaces in the axilla, the other two being the quadrangular space and the triangular interval. The triangular space is bordered by the teres major muscle, the teres minor muscle, and the long head of the triceps brachii muscle.

Anatomy

The triangular space is a small, triangular gap located in the posterior axilla. It is bordered by:

• Superiorly: the teres minor muscle
• Inferiorly: the teres major muscle
• Laterally: the long head of the triceps brachii muscle

The circumflex scapular artery, a branch of the subscapular artery, passes through the triangular space.

Clinical significance

Due to the passage of the circumflex scapular artery through the triangular space, injury to this area can lead to significant bleeding. Furthermore, the close proximity of the triangular space to the brachial plexus and axillary artery means that injury to this area can also result in nerve damage and further vascular injury.

See also

• Axilla
• Quadrangular space
• Triangular interval
• Teres major muscle
• Teres minor muscle
• Triceps brachii muscle
• Circumflex scapular artery
• Subscapular artery
• Brachial plexus
• Axillary artery

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