The rectus abdominis muscle, also known as the ?six pack?, is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some other animals). There are two parallel muscles, separated by a midline band of connective tissue called the linea alba (white line). It extends from the pubic symphysis, pubic crest and pubic tubercle inferiorly to the xiphoid process and costal cartilages of ribs V to VII superiorly.[1]Superior to the arcuate line, It is contained in the rectus sheath.The rectus is usually crossed by three fibrous bands linked by the tendinous intersections. While the ?six pack? is by far the most common configuration of the muscle bellies of the rectus, there exist rare anatomic variations which result in the appearance of eight (?eight pack?), ten, or asymmetrically arranged segments.[citation needed] All these variations are functionally equivalent.
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