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Iliocostalis lumborum
Other Terms:
Musculus iliocostalis lumborum,
Muscle ilio-costal des lombes
Muscle parts
Lumbar part or lateral division of lumbar erector spinae; Thoracic part
Latin name
Musculus iliocostalis lumborum
Latin muscle parts
Pars lumbalis or divisio lateralis musculus erectores spinae lumborum; Pars thoracica
Group
Epaxial muscle – Erector spinae – Iliocostalis
Etymology
The English name for this muscle is the muscle between the groin, or flank, and the ribs in the loin region. The word iliocostalis comes from the Latin words ilium meaning “groin, or flank,” and costa meaning “rib.” Lumborum comes from the Latin lumbus for “loin.”
Origin
Posterior iliac crest and adjoining costal part of sacrum
Insertion
Tip of transverse processes of L1 to L5 and lower borders of ribs 6 to 12 near the angle
Action
Extension of the vertebral column; assist with lateral flexion of vertebral column;; postural stabilization of vertebral column.
Nerve supply
Dorsal rami of thoracic and lumbar spinal nerves (T7 to L3)
Blood supply
Dorsal branches of the lumbar arteries from the aorta. Dorsal branches of the lateral sacral artery from the internal iliac artery.
Latin
Musculus iliocostalis lumborum
French
Muscle ilio-costal des lombes
