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Internal oblique

Other Terms: Obliquus internus abdominis muscle, Musculus obliquus internus abdominis, Muscle oblique interne de l'abdomen

Muscle parts

None

Latin name

Musculus obliquus internus abdominis

Latin muscle parts

None

Group

Abdominal wall – lateral musculature – middle layer

Etymology

This muscle’s name in English is the within (middle) slanting muscle of the belly. The Latin term obliquus means slanting or sideways and describes its orientation. The Latin term internus means “within.” The word abdomen is of uncertain etymology. Two possible origins of this word are from the Latin abdere meaning “to stow away,” which the abdomen does to the digestive organs. The other possibility is that it comes from adipem meaning “fat.”

Origin

Lateral half of inguinal ligament, anterior portion of iliac crest, and thoracolumbar fascia

Insertion

Costal cartilages of lowest four ribs and linea alba

Action

Strong compressor of the abdominal cavity; rotates trunk to the same side; weakly assists in flexion of lumbar vertebrae

Nerve supply

Intercostal nerves (T7 to T11), subcostal nerve (T12), and iliohypogastric and ilioinguinal nerves (both from L1)

Blood supply

Numerous arteries supply and anastomose within this extensive muscle sheet including the superior and inferior epigastric arteries, posterior intercostal arteries from the three lowest rib spaces, the subcostal artery, the musculophrenic artery, superficial epigastric artery, superficial circumflex iliac artery, ascending branch of the deep circumflex iliac artery, lumbar arteries.

Latin

Musculus obliquus internus abdominis

French

Muscle oblique interne de l'abdomen

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