Upper Limb - Special Regions - Quadrangular Triangular Spaces

Question 1

Name the four boundaries of the Quadrangular Space.

Answer 1

Superior: Teres minor / Subscapularis
Inferior: Teres major
Lateral: Humerus
Medial: Long head of triceps

Question 2

Which structures are transmitted through the quadrangular space?

Answer 2

Axillary nerve

Posterior circumflex humeral artery

Question 3

Name the three boundaries of the Triangular Space. (assume that the triangular SPACE is the more superior one, and the triangular INTERVAL is the more inferior one)

Answer 3

Superior: Teres minor / Subscapularis
Inferior: Teres major
Lateral: Long head of triceps

Question 4

What structures are transmitted through the triangular space?

Answer 4

Subscapular artery (or just its circumflex scapular branch).

Question 5

What structures are transmitted through the triangular space?

Answer 5

Subscapular artery (or just its circumflex scapular branch).

Question 6

What is the triangular interval?

Answer 6

This is a space near the mid-shaft of the humerus, bounded by the humerus, the long head of triceps, and the Teres major superiorly. It transmits the Deep Artery of the Arm, and the Radial Nerve.