Origin (Anterior)
Lateral 1/4 clavicle & anterior 1/3 lateral acromion
Origin (Lateral)
Middle 1/3 lateral acromion
Origin (Posterior)
Posterior 1/3 acromion & spine of scapula
Insertion
Deltoid tuberosity of humerus
Actions
- Shoulder abduction
- Shoulder flexion & extension
- Horizontal adduction & abduction
- Shoulder medial & lateral rotation
Innervation
- Axillary nerve (C5, C6)
Blood Supply
- Thoracoacromial branch of the axillary artery (primary artery)
- Posterior circumflex humeral artery
- Deltoid branches of profunda brachii artery
Would you like to learn more about the deltoid muscle? Then check out the deltoid muscle article and video by clicking the link below: Deltoid Muscle Anatomy
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