rectus abdominus
muscle that extends from the ribs to the pelvis and compresses the abdomen
Rectus abdominis is a paired muscle in the abdomen that runs vertically on either side of the linea alba. This muscle is commonly known as the “six-pack muscle” due to its appearance in physically fit individuals. Rectus Abdominis is a long, flat muscle that extends from the pubic symphysis to the xiphoid process and the fifth, sixth and seventh costal cartilages. The muscle is enclosed in a fibrous structure called the rectus sheath, which is formed by the aponeuroses of the external and internal oblique muscles.
Rectus Abdominis functions in trunk flexion and stabilization, as well as in forced expiration. It is also involved in the coughing and sneezing reflexes. This muscle is commonly used in exercises like sit-ups, crunches, and planks to strengthen and tone the abdominal muscles.
Injuries to the rectus abdominis muscle are relatively uncommon, but can occur due to overuse, trauma, or sports-related injuries. Injuries to this muscle can cause pain and discomfort in the abdominal area, and may require rest, stretching, and physical therapy to recover fully.
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