transversus abdominis (muscle)
Definition: deepest layer of flat muscles of the anterolateral abdominal wall; 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; rotates and flexes trunk; nerve supply, lower thoracic.
Synonym(s): musculus transversus abdominisTA, musculus transversalis abdominis, transverse muscle of abdomen
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