Intervals & Spaces

Question 1

What are the boundaries of the Quadrangular Space?

Answer 1

• Superior– inferior margin of teres minor.
• Lateral– surgical neck of thehumerus.
• Medial– long head of triceps brachii.
• Inferior– superior aspect of teres major.

Question 2

What are the contents of the Quadrangular Space?

Answer 2

Axillary nerveand posterior circumflex humeral artery

Question 3

What are the contents of the Triangular Space?

Answer 3

Circumflex scapular arteryand vein.

Question 4

What are the boundaries of the Triangular Space?

Answer 4

• 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).

Question 5

What are the boundaries of the Triangular Interval?

Answer 5

• Superior–Inferior border of the teres major.
• Lateral–Shaft of the humerus and lateral head of the triceps brachii.
• Medial–Lateral border of the long head of the triceps brachii.

Question 6

What are the contents of the Triangular Interval?

Answer 6

Radial nerveand profunda brachii artery