Serratus Anterior

Muscle Origin

First 9 ribs to ventral, vertebral border of scapula.

Fleshy slips from the lateral aspect of the superior eight ribs and anterior intercostal membranes from the midclavicular line, the lower four slips interdigitating with external abdominal oblique.

Insertion

Costal aspect of medial margin of the scapula.

Volar surface of the axillary border of the scapula, spanning the superior and inferior angles.

Action

Abducts scapula.anatomy-model-muscles-arm-032-edited

The serratus anterior protracts and stabilizes scapula, assists in upward rotation.

Innervation – Nerve control

Long thoracic nerve (from roots of brachial plexus C5, 6, 7).

The serratus anterior is innervated by the long thoracic nerve (Nerve of Bell), a branch of the brachial plexus. The long thoracic nerve travels inferiorly on the surface of the serratus. The nerve is especially vulnerable during certain types of surgery (for example, during lymph node clearance from the axilla (e.g., in case of axillary dissection in a surgery for breast cancer)). Damage to this nerve can lead to a winged scapula. Wiki

Artery

Lateral thoracic artery (upper part), thoracodorsal artery (lower part).

The lateral thoracic artery, also known as the external mammary artery, distributes oxygenated blood to lateral regions of the breast and upper thorax.
The thoracodorsal artery is a branch of the subscapular artery which travels inferiorly with the thoracodorsal nerve. It supplies the latissimus dorsi.

Antagonist muscles

Rhomboid major, Rhomboid minor, Trapezius.

Deltoid, Supraspinatus, Infraspinatus, Teres major, Teres minor, Subscapularis.

Pictures of muscles

 

Trigger Point Referrals

 

Stretching description

 

Exercises

 

Injuries

 

Treatment

 

Additional Resources

The Wellness Digest
Sports Lab
Wiki

 

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