Rectus Abdominis Muscle
The segmental Rectus Abdominis muscle arises from the pubic crest and attaches to the costal cartilages of ribs 5,6, and 7. It is interrupted at three transverse levels (xiphoid process, ninth costal cartilage, and umbilicus). These visible features represent the firm attachment of the Tendinous Intersections of the rectus abdominus to the anterior layer of the rectus sheath. The linea alba separates the recti. The Linea Semilunaris marks the lateral margin of the rectus abdominis.