Rectus Abdominis

Rectus Abdominis Muscle

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 : Crunches or sit-ups.

Example stretches : Abdominal stretch.