Mar 27, Lateral Deltoid | Outer Deltoid Muscle Anatomy & Exercises

The lateral deltoid is the one of the three heads of the deltoid muscle. When it is developed, your shoulders appear much broader and more "capped." It functions to raise your arms up at your sides.

On this page, you can find all information you'd want about this muscle. Learn its anatomy, view pictures and discover the best exercises for training it.

Use the table of contents (TOC) on the right to easily navigate through this guide.

Outer deltoid (delt)Outer shoulderSide deltoid (delt)Side shoulder

Origin

Lateral portion of the acromion

Insertion

Lateral portion of the deltoid

Function

Shoulder abductionTransverse shoulder abductionShoulder flexion^ up to TOC

Barbell

Dumbbell

Cable

Cable Lateral RaiseCable Upright Row

Machine

Machine Lateral RaiseBarbell-Machine Upright Row

Stretch

Fixed Bar StretchSide Deltoid Stretch^ up to TOC

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