Abdominal wall

Question 1

Rectus abdominis origin, insertion and action?

Answer 1

O - Superior: xyphoid process and costal cartilages
I - Inferior: pubic crest
A - Trunk flexion

Question 2

External oblique abdominal origin, insertion and actions?

Answer 2

O - Posterior: outer surface lower 8 ribs
I - Anterolateral: iliac crest and linea alba
A - bi = trunk flexion, uni = contralateral trunk rotation

Question 3

Internal oblique abdominal origin, insertion and actions?

Answer 3

O - Inferior: inguinal ligament, iliac crest, TL fascia
I - Superior: lower ribs and costal cartilages and linea alba
A - bi = trunk flexion, uni = ipsilateral trunk rotation

Question 4

Transverse abdominal origin, insertion and action?

Answer 4

O - Posterolateral: TL fascia, lower ribs, anterior iliac crest and inguinal ligament
I - Anterior: linea alba and pubic crest
A - stabilise trunk, increase intra-abdominal pressure

Question 5

Quadratus lumborum origin, insertion and actions?

Answer 5

O - Inferior: iliac crest
I - Superior: 12th rib and lumbar transverse processes
A - bi = stabilise lumbar spine, uni = ipsilateral LF

Question 6

Innervation of all abdominal wall muscles?

Answer 6

Ventral rami spinal nerves