The recti are a group of abdominal muscles that are located in the anterior and lateral walls of the abdomen. They are responsible for flexing, rotating, and stabilizing the trunk of the body. The recti are composed of four muscles: the rectus abdominis, the external oblique, the internal oblique, and the transverse abdominis. These muscles work together to provide stability and support to the abdominal wall and help to protect the organs within the abdomen.