October 25, 2014. Ranking the greatest battleships of all time is a tad easier than ranking naval battles. Both involve comparing apples with oranges. But at least taking the measure of individual men-of-war involves comparing one apple with one orange.
This lumpy appearance results in the rectus abdominis muscles being referred to as the âsix-pack.â. The name rectus abdominis comes from the Latin words for âstraightâ and âabdominal,â indicating that its fibers run in a straight vertical line through the abdominal region of the body.... Click to read more below.
The Rectus Abdominis and Rectus sheath  The rectus muscle extends from the xiphoid process of the sternum and 5,6,7th costal cartilages to the pubic symphysis and pubic crest.  The muscle is enclosed within the rectus sheath formed by the aponeuroses of the lateral abdominal muscles.