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Serratus posterior inferior

Other Terms: Inferior serratus posterior, Musculus serratus posterior inferior, Muscle dentelé postérieur inférieur

Muscle parts

None

Latin name

Musculus serratus posterior inferior

Latin muscle parts

None

Group

Thoracic wall – lateral musculature – supracostal or outermost layer

Etymology

In English, this muscle's name is the lower, 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 word inferior comes out of inferus meaning “low or lower.”

Origin

Spinous processes of the lower two thoracic and upper 2 or 3 lumbar vertebrae

Insertion

Lower borders of the four inferior ribs

Action

Depresses ribs, but appears to be inactive during respiration.

Nerve supply

Intercostal nerves (T9 through T11) and subcostal nerve (T12)

Blood supply

Perforating branches of the lumbar arteries from the aorta.

Latin

Musculus serratus posterior inferior

French

Muscle dentelé postérieur inférieur

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