Musculoskeletal Anatomy: Abdominal wall

Question 1

What are the muscles of the abdominal wall?

Answer 1

Rectus abdominis, external oblique, internal oblique, transversus abdominis.

Question 2

What is the origin, insertion and action of rectus abdominis?

Answer 2

O: Pubic crest/superior pubic rami | I: costal cartilage of ribs V to VII and the xiphoid process. m| A: compression of the abdominal wall and flexion of the vertebral column.

Question 3

What is the origin, insertion and action of the external oblique?

Answer 3

O: Ribs V to XII | I: Linea alba | A: Compression of the abdominal wall - bilateral lumbar flexion - unilateral ipsilateral lumbar flexion and unilateral contralateral rotation.

Question 4

What is the origin, insertion and action of the internal oblique?

Answer 4

O: Thoracolumbar fascia and anterior hip | I: Linea alba and ribs X to XII | A: Bilateral lumbar flexion - Unilateral ipsilateral lateral flexion and rotation - compression of the abdonimal wall.

Question 5

What is the oringin, insertion and action of the transversus abdominis?

Answer 5

O: Ribs VII to XII, thoracolumbar fascia and anterior hip bone | I: Linea alba and pubic tubercle | A: Compression of the abdonimal wall