Inter muscular space in scapular region

Upper triangular space- 

1. Boundaries:
• Laterally- Long head of triceps brachii muscle
• Inferiorly- Teres major muscle
• Superiorly- Teres minor muscle

2. Content:
• Circumflex scapular vessels 

Boundaries 

Upper triangular

space

Lower triangular
space

Quadrangular

space

Lateral

LH of triceps
brachii muscle

Shaft of
the humerus

Shaft of

the humerus

Inferior 

Teres major
muscle

Teres major

muscle

Teres major

muscle

Superior 

Teres minor
muscle

X

Teres minor

muscle

Medial

X

LH of triceps

brachii muscle

LH of triceps

brachii muscle



Quadrangular space- 


1. Boundaries-

• Medially- Long head of triceps brachii muscle

• Laterally- Shaft of the humerus

• Inferiorly- Teres major muscle

• Superiorly- Teres minor muscle


2. Content: 

• Axillary nerve (It supplies to Deltoid and Teres minor muscle)

• Posterior circumflex humeral artery




Lower triangular space- 


1. Boundaries-

• Medially- Long head of triceps brachii muscle

• Laterally- Shaft of the humerus

• Inferiorly- Teres major muscle


2. Content- 

• Profunda brachii artery (Deep brachial artery)

• Radial nerve 



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