Internal oblique

Internal oblique

(Science: anatomy, muscle) origin, iliac fascia deep to lateral part of inguinal ligament, anterior half of crest of ilium, and lumbar fascia; insertion, tenth to twelfth ribs and sheath of rectus; some of the fibres from inguinal ligament terminate in the conjoint tendon; action, diminishes capacity of abdomen, flexes lumbar vertebral column (bends thorax forward); nerve supply, lower thoracic.

Synonym: musculus obliquus internus abdominis, abdominal internal oblique muscle.

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