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Deltoid Muscle: (Musculus Deltoideus)
a. Anterior and middle heads.
b. Rotating 3D Image of skeleton and muscle (in new tab or window).

Attachments: Origin & Insertion
Origin: (proximal attachments)
a. Anterior head: anterior surface of the lateral clavicle.
b. Middle head: acromion process and spine of the scapula.

Insertion: (distal attachments)
a. Deltoid tuberosity of the humerus.

Anterior head:
a. Flexes the arm at the shoulder.
b. Medially rotates the arm at the shoulder.
Middle head:
a. Abducts the arm at the shoulder.

Nerve & Nerve Roots:
a. Nerve: Axillary nerve
b. Nerve roots: C5 and C6

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Cervical Vertebrae