Tendinous insertions divide the rectus abdominis into segments externally visible on the abdomen of a well-muscled person.
The rectus abdominis muscle, or "straight abdominal," is a pair of straight muscles that is also referred to as the "abdominal muscle" or simply the "abs." There are two parallel muscles that are divided by the linea alba, a midline strip of connective tissue. It reaches from the inferior pubic symphysis, pubic crest, and pubic tubercle to the superior xiphoid process and costal cartilages of ribs V to VII. The pubic crest and the pubic symphysis serve as the proximal attachments. It fastens distally at the xiphoid process of the sternum and the costal cartilages of ribs 5-7.
The aponeuroses of the lateral abdominal muscles make up the rectus sheath, which protects the rectus abdominis muscle. The linea defines the rectus as the outside, most lateral line.
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