Question: what is the origin and insertion of the rectus abdominis?
Answer: Origin and insertion The rectus abdominis muscle is composed of a pair of vertically oriented muscles. ... The medial head originates from the pubic symphysis, interlacing with the fibres of the muscle on the contralateral side. It inserts onto the xiphoid process of the sternum and onto the costal cartilages of ribs 5-7.