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Deltoid

Region

Origin & Insertion

['Origin: Lateral third of clavicle, acromion, spine of scapula', 'Insertion: Deltoid tuberosity of humerus']

Synergistic Muscles

['Rotator cuff', 'Trapezius']

Joints

['Glenohumeral joint']

Primary Actions

['Anterior: Shoulder flexion', 'Middle: Abduction', 'Posterior: Extension']

Nerve & Spinal Segment

Axillary nerve

Brachial plexus; C5–C6

Interesting

Divided into anterior, middle, and posterior fibers. [Netter’s]

Reversal of Action

Common Dysfunctions

Deltoid atrophy, weak shoulder abduction, axillary nerve injury

How to Stretch

Arm crossbody stretch or overhead reach.

Trigger Points

How to Strengthen

Isolated arm raises in 3 planes.

Concentric Action

Applications:

Eccentric Action

Isotonic Action

Related Conditions

['Rotator cuff injury', 'Shoulder impingement']

Isometric Action

Exercise Ideas

['Lateral raise', 'Front raise', 'Reverse fly']

Related Blogs

Images

Videos

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