Anatomical Spaces and Relationships of Structures in Posterior Scapular Region

Triangular Space

serves as a passageway between the anterior axilla area and posterior scapular region

• Boundaries: medial margin of the LH of triceps, superior margin of the teres major, inferior margin of the teres minor

Mnemonics: TSA

Triangular

Space

Artery: circumflex scapular

Quadrangular Space

serves as a passageway between the anterior axilla area and posterior scapular region

• Boundaries formed by: inferior margin of the teres minor, surgical neck of the humerus, superior margin of the teres major and lateral margin of the LH of the triceps

Mnemonics: QAP (questions a person)

Quadrangular space

Axillary nerve

Posterior humeral circumflex artery

Triangular Interval

serves as a passageway between the anterior and posterior compartments of the arm

• posterior compartment of the arm and axilla

• Boundaries: lateral margin of the LH of triceps, shaft of humerus, inferior margin of the teres minor

Mnemonics: TIRAD (traveling internationally responsibly and dutifully)

Triangular interval
Interval
Radial nerve
Artery
Deep brachial

Anatomical Spaces

Muscles of teres minor, teres major, long head of the tricep and the humerus create 3 anatomical spaces

Suprascapular Foramen

serve as a passageway between: the base of the neck and the posterior scapular region

structure include: suprascapular nerve, suprascapular artery and vein-course w/ nerve (However, the artery and nerve usually travel superior to the ligament)

• boundaries: suprascpular notch, superior transverse scapular ligament