Facts about Deltoid Muscle

1. 06

   Paralysis of the deltoid muscle results in significant difficulty raising the arm, a condition often seen after axillary nerve injury from shoulder dislocation.

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2. 05

   Originating from the clavicle, acromion, and spine of the scapula, the deltoid muscle gives the shoulder its rounded, triangular shape.

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3. 04

   A common intramuscular injection site, the deltoid muscle is used for vaccines such as influenza and tetanus due to its accessible location.

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4. 03

   Innervation of the deltoid muscle comes from the axillary nerve, which arises from the posterior cord of the brachial plexus.

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5. 02

   Abduction of the arm at the shoulder is the primary function of the deltoid muscle, with the lateral portion most responsible for lifting the arm away from the body.

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6. 01

   The deltoid muscle is divided into three distinct portions — anterior, lateral, and posterior — all converging onto the deltoid tuberosity of the humerus.

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