Mnemonic
Triangular Interval, Triangular Space and Quadrangular Space
A memory aid for the contents of the three intermuscular spaces at the back of the shoulder.
Expansion
Triangular space holds the circumflex scapular artery; quadrangular space holds the axillary nerve; triangular interval holds the radial nerve
Expansion
- Triangular space - transmits the circumflex scapular artery
- Quadrangular space - transmits the axillary nerve and posterior circumflex
humeral artery
- Triangular interval - transmits the radial nerve and the profunda brachii
(deep brachial) artery
The long head of triceps is the shared landmark that separates them.