Musculus rectus abdominis

.

Origin:


 * 5.–7. ribs;
 * xiphoid process.

Insertion: pubic bone between symphysis and tuberculum pubicum.

Innervation:


 * nervus intercostalis (7.–11.);
 * nervus subcostalis.

Function:


 * bends the spine (ventral flexion)
 * changes the tilt of the pelvis,
 * participates in the abdominal press;
 * accessory expiratory muscle.

Formations on the rectus abdominis muscle:


 * tendinous intersection: three transverse tendinous bands crossing the muscle;
 * rectus sheath: tendon sheath surrounding the muscle
 * linea alba: fibrous band in the middle (vertically) of the muscle.