Deltoid

Description

The deltoid muscle can be divided into seven segments. The anterior segments (A1, A2 and A3) converge and attach to the anterior insertion. The middle segment (M1) attaches to the middle insertion. The posterior segments (P1, P2 and P3) converge and attach to the posterior insertion

Name

• Deltoid
• Deltoideus

Origin

• Acromion
• Crest of spine of scapula
• Lateral 1/3rd of clavicle

Insertion

• Deltoid tuberosity of humerus

Actions

• Abduction of arm
• Flexion and internal rotation with anterior fibers
• External rotation and extension with posterior fibers

Vascular Supply

• Posterior circumflex humeral artery

Nerve

• Axillary Nerve

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Clinical Significance

• Needs to be updated

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See Also

• Shoulder Pain Main
• Physical Exam Shoulder
• Shoulder Anatomy

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