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Serratus posterior superior

Other Terms: Superior serratus posterior, Musculus serratus posterior superior, Muscle dentelé postérieur supérieur

Muscle parts

None

Latin name

Musculus serratus posterior superior

Latin muscle parts

None

Group

Thoracic wall – lateral musculature – supracostal or outermost layer

Etymology

In English, this muscle's name is the upper, back saw-like muscle. The term serratus comes from the Latin term serra meaning “saw.” This reference to a saw arises from the jagged anterior border of the muscle, which looks like the cutting-teeth of a saw. The Latin term posterior is derived from the Latin post meaning “afterwards.” The Latin term superior is derived from the Latin super meaning “above.”

Origin

Spinous processes of 7th cervical to first thoracic vertebrae

Insertion

Upper borders of 2nd to 5th ribs lateral to their angles

Action

Elevates ribs, but appears to be inactive during respiration.

Nerve supply

Intercostal nerves (T2 through T5)

Blood supply

Perforating branches of the posterior intercostal arteries from the aorta and the dorsal scapular artery.

Latin

Musculus serratus posterior superior

French

Muscle dentelé postérieur supérieur

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