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Quadratus lumborum
Other Terms:
Muscle of posterior abdominal wall,
Musculus quadratus lumborum,
Muscle carré des lombes
Muscle parts
None
Latin name
Musculus quadratus lumborum
Latin muscle parts
None
Group
Abdominal wall – lateral musculature – internal layer
Etymology
The muscle’s name in English is the square muscle of the loin. The word quadratus comes from the Latin quadrus meaning “square.” Lumborum comes from the Latin lumbus for “loin.”
Origin
Posterior iliac crest
Insertion
Medial half of 12th rib and transverse processes of lumbar vertebrae
Action
Fixes 12th rib to stabilize diaphragm attachments during inspiration; lateral flexes the vertebral column, extends lumbar vertebrae
Nerve supply
Subcostal nerve (T12), iliohypogastric and ilioinguinal nerve (both from L1), and branches from the ventral rami (L2 and L3)
Blood supply
Subcostal artery; lumbar arteries; lumbar branch of the iliolumbar artery; artery lumbalis ima from the median sacral artery.
Latin
Musculus quadratus lumborum
French
Muscle carré des lombes
