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Posterior Deltoid

Posterior fibers of the deltoid. Horizontal abductor and shoulder extender; antagonist to elevation in anterior arm positions.

Draft95%

Anatomy

Origin: Spine of scapula
Insertion: Deltoid tuberosity of humerus
Action: Horizontal abduction, extension; antagonist to elevation in anterior arm positions
Innervation: Axillary nerve (anterior branch in 91.5% of cases, posterior branch in 8.5%)
Blood Supply: Posterior circumflex humeral artery

Movements (3)

Movement	Joint	Role	Notes
Shoulder Extension	Glenohumeral Joint	Primary	—
Shoulder Horizontal Abduction	Glenohumeral Joint	Primary	—
Shoulder External Rotation	Glenohumeral Joint	Secondary	—

Exercises (38)

Exercise	Role
Towel Row	Primary
Face Pull	Primary
Barbell Row	Primary
Cross-Body Shoulder Stretch (Horizontal Adduction)	Primary
Band Pull-Apart	Primary
Prone Y-T-W Raise	Primary
Prone T with External Rotation	Secondary
Side-Lying External Rotation	Secondary
Prone Y-Raise	Secondary
Low Row (Band/Cable)	Secondary
Inverted Row	Secondary
Bent-Over Row	Secondary
Lat Pulldown	Secondary
Seated Cable Row	Secondary
Resisted External Rotation	Secondary
Scapular Stability Exercises (Rows / Scapular Retraction)	Secondary
Prone Horizontal Abduction with External Rotation (Prone Y/T)	Secondary
Empty Can Exercise (Scaption with Thumbs Down)	Secondary
Prone External Rotation at 90° Abduction	Secondary
Sleeper Stretch (Posterior Shoulder)	Secondary
Chin-Up	Secondary
Lateral Raise	Secondary
Superman	Secondary
Doorway Isometric Row	Secondary
Triceps Pushdown	Stabilizer
Water Bottle Lateral Raise	Synergist
Pull-Up	Synergist
Wall Angel	Synergist
External Rotation at 0° Abduction (Side-Lying or Band)	Synergist
Cobra Pose	Synergist
Towel Scapular Retraction	Synergist
World's Greatest Stretch	Synergist
Dumbbell Bench Press	lengthening
Dynamic Hug	lengthening
Chest Fly	lengthening
Pec Deck	lengthening
Landmine Press	lengthening
Barbell Bench Press	lengthening

Sources

Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of Posterior Deltoid — origin, insertion, action, innervation
Muscles: Testing and Function with Posture and Pain — Manual muscle testing for Posterior Deltoid