transversus abdominis (muscle)


trans·ver·sus ab·do·mi·nis (mus·cle)

[TA] 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 abdominis [TA], musculus transversalis abdominis, transverse muscle of abdomen