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Muscle: Deltoid Muscle: posterior head (Musculus deltoideus)

Attachments: Origin & Insertion
Origin: (proximal attachment)
a. Spine of scapula.
Insertion: (distal attachment)
a. Deltoid tuberosity of humerus.

a. Laterally rotates the arm at the shoulder (glenohumeral) joint.
b. Extends the arm at the shoulder (glenohumeral) joint.

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

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Subscapularis Muscle