Intramuscular spaces in scapular region/ axillary spaces / spaces in shoulder region

Intramuscular spaces in scapular region

There are three spaces present in scapular region .

it is also known as axillary spaces or spaces in shoulder region 
. 

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Quadrangular Space

o   Boundary:

medial: long head of triceps

lateral: humeral shaft

superior: teres minor

inferior: teres major

o   Contents

·         axillary nerve: passes through the quadrilateral space on its path to innervate the teres minor and deltoid and provide sensation to the lateral arm

·         posterior humeral circumflex artery

superior triangular space

• Boundary
• inferior: teres major
• lateral: long head of triceps
• superior: lower border of teres minor
• Contents

  Scapular circumflex artery

Inferior triangular space

Boundary

o    superior: teres major

o    lateral: lateral head of the triceps or the humerus

o    medial: long head of the triceps

·         Contents

o    profunda brachii artery

radial nerve