• deltoid muscle
• supraspinatus muscle
• infraspinatus muscle
• teres minor muscle
• teres major muscle
• long head of triceps brachii muscle

Nerves

• axillary nerve
• suprascapular nerve

Arteries

• posterior circumflex humeral artery
• circumflex scapular artery
• suprascapular artery

Other

• quadrangular space
• triangular space

On the skeleton, find:

• clavicle
• spine of scapula
• acromion
• deltoid tuberosity of humerus
• superior transverse ligament of the scapula