Abdominal muscles
The Rectus Abdominis The most well-known and prominent abdominal muscle is the rectus abdominis. It is the long, flat muscle that extends vertically between the pubis and the fifth, sixth, and seventh ribs. A strong tendinous sheath called the “linea alba,” or white line, divides the rectus abdominis down the middle, and three more horizontal tendinous sheaths give the muscle its familiar “washboard” look in very...
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