The musculus rectus abdominis, commonly referred to as the rectus abdominis muscle, is a paired, long, flat, strap-like muscle located in the anterior wall of the abdomen. It is one of the primary muscles that forms the well-known six-pack or washboard abs appearance.
The rectus abdominis muscle originates from the pubic symphysis and the pubic crest, which are located in the pelvic region. It then extends upwards, attaching to the costal cartilages of the fifth, sixth, and seventh ribs. The muscle is surrounded and held together by a strong band of connective tissue called the linea alba.
The main function of the rectus abdominis is to flex the lumbar spine, which allows for forward bending of the trunk. It also assists in stabilizing the trunk and pelvis during movements like sitting up, lifting, and performing various exercises. Additionally, the muscle provides support and protection to the abdominal organs.
The rectus abdominis muscle is often specifically targeted in fitness and bodybuilding to achieve a defined and sculpted abdominal appearance. Regular exercises such as crunches, sit-ups, and planks are commonly employed to strengthen and develop this muscle. However, it is important to note that the visibility of the rectus abdominis is primarily influenced by body fat percentage rather than muscle size alone.
