Rectus Abdominis Muscle

The rectus abdominis muscle is a long, flat muscle that extends vertically the entire length of the abdomen. It is enclosed in a sheath that holds it in position but does not restrict its movements during its contractions. The muscle flexes the vertebral column, particularly in the lumbar portion, drawing the breastbone (sternum) toward the pubis. It also tenses the abdominal wall and aids in compressing the contents of the abdomen.

 

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