Rectus Abdominis

Rectus Abdominis is the most superficial of the abdominal muscles. It is this muscle which forms the six-pack shape!

Origin

  • Crest of the pubis.
  • Pubic symphesis.

Insertion

  • Xiphoid process (base of the sternum).
  • 5th,6th and 7th costal cartilages.

Actions

  • Flexes lumbar spine.

Innervation

  • Ventral rami of thoracic nerves.

Daily uses

  • Moving from lying to sitting.

Example strengthening exercises

Example stretches