Diagram of abdominals. The abdomen is the front part of the abdominal segment of the trunk. The rectus abdominis is the large muscle in the mid section of the abdomen. Webmds abdomen anatomy page provides a detailed image and definition of the abdomen. The rectus abdominis is positioned between the ribs and the pubic bone at the front of the pelvis and is actually made up of 8 distinct muscle bellies.
It enables the tilt of the pelvis and the curvature of the lower spine. The region occupied by the abdomen is called the abdominal cavity. The three anterolateral flat muscles obliques and transversus abdominis form an aponeurosis on both sides that is a broad flat tendon called rectus sheat enclose the rectus abdominis and consists of two layers anterior and posterior layer. These muscles help the body bend at the waist.
The abdomen colloquially called the stomach belly tummy or midriff is the part of the body between the thorax chest and pelvis in humans and in other vertebrates. Pyramidalis with rectus abdominis it forms the anterior abdominal wall when they contract bilateral tense the linea alba.