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The Rectus Abdominis Muscle is a long, flat, paired skeletal muscle located on the anterior surface of the abdominal wall. It is commonly known as the "abs" or "diamondback muscle." This bilateral muscle is separated from each other by the midline connective tissue line, the linea alba. Each muscle bundle is surrounded by a serrated connective tissue border called the linea semilunaris. The rectus abdominis originates inferiorly from the pubic symphysis, pubic crest, and pubic tubercle, and exte