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Muscle:
Deltoid Muscle: (Anterior; Middle)

(Muscularis Deltoideus)

Attachments: Origin & Insertion
Origin: (proximal attachments)

a. Anterior portion: anterior surface of the lateral clavicle.

b. Middle portion: acromion process and spine of the scapula.

Insertion: (distal attachments)

a. Deltoid tuberosity of the humerus.

Actions:
Anterior portion:

a. Flexes the arm at the shoulder.

b. Medially rotates the arm at the shoulder.

Middle portion:

a. Abducts the arm at the shoulder.

Nerves & Spinal Segment:
a. Nerve: Axillary nerve

b. Spinal segment: C5 and C6


















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Cervical Vertebrae