Anatomy Of The Abdominal Wall

The abdominal wall can be divided into two separate anatomic parts, each of which functions differently. The front wall consists of one muscle, the rectus abdominis (also known as the "abs"). This muscle arises from the lower margin of the rib cage and sternum and passes vertically downward to attach on the pubic bone. The two rectus abdominis muscles (one on each side) are encased in a sheath of fascia that forms the central demarcation down the middle of the abs, known as the linea alba. Fascia divisions in the muscles are responsible for the "six-pack" appearance. The rectus muscles cause flexion of the trunk, bending the torso forward toward the legs. An effective abdominal workout should include exercises that target all areas of your midsection. For your upper abs select a crunch or sit-up. For your lower abs choose from leg raises, knee-ups, or reverse crunches. To complete your workout, target the side wall with a twisting maneuver, oblique crunch, or side bend.