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Muscle: Infraspinatus (Musculus infraspinatus)

Attachments: Origin & Insertion
Origin: (proximal attachment)
a. Infraspinous fossa of the scapula.
Insertion: (distal attachment)
a. Middle part of the greater tubercle of the humerus.

a. Laterally rotates the arm at the shoulder (glenohumeral) joint.
b. Helps stablize the shoulder by drawing the humerus toward the glenoid fossa of the scapula.

Nerves & Nerve Roots:
a. Suprascapular nerve.
a. C5 and C6.

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Subscapularis Muscle