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From Biology-Online Dictionary
(Science: anatomy, muscle) origin, seventh to twelfth costal cartilages, lumbar fascia, iliac crest, and inguinal ligament; insertion, xiphoid cartilage and linea alba and, through the conjoint tendon, pubic tubercle and pecten; action, compresses abdominal contents; nerve supply, lower thoracic.
Synonym: musculus transversus abdominis, musculus transversalis abdominis, transverse muscle of abdomen.