Muscles that MOVE the abdomen

Question 1

Transversus abdominis

Answer 1

ORIGIN
Iliac crest, inguinal ligament, thoracolumbar fascia, and costal cartilages of ribs 7-12.

INSERTION
Abdominal aponeurosis, linea alba, and pubic crest.

ACTION
Compresses abdominal contents.

INNERVATION
Intercostal nerves.

Question 2

Rectus abdominis

Answer 2

ORIGIN
Crest of pubis and Symphysis pubis.

INSERTION
Costal cartilage of ribs 5-7, xiphoid process.

ACTION
Flexes trunk and compresses abdominal contents.

INNVERVATION
Intercostal nerves.

Question 3

External oblique

Answer 3

ORIGIN
Ribs 5-12.

INSERTION
Abdominal aponeurosis, linea alba, and pubic crest.

ACTION
Compression of abdominal contents, flexes trunk (bilaterally), lateral trunk flexion (unilaterally), and trunk rotation.

INNVERVATION
Intercostal nerves.

Question 4

Internal oblique

Answer 4

ORIGIN
Inguinal ligament, Iliac crest, and the thoracomlumbar fascia.

INSERTION
Abdominal aponeurosis, linea alba, and ribs 10-12.

ACTION
Compression of abdominal contents, flexes trunk (bilaterally), lateral trunk flexion (unilaterally), and trunk rotation.

INNVERVATION
Intercostal nerves.