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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
