Anterior Abdominal Wall Muscles

Question 1

External abdominal oblique

Answer 1

O: external surface of the 5th to 12th ribs
I: Linea alba, public crest, iliac crest, pubic symphysis
N: inferior 5 thoracic nerves, subcostal, iliohypogastric nerve
A: flex and rotate the trunk, laterally rotate the trunk, compress abdominal contents

Question 2

Internal abdominal oblique

Answer 2

O: thoracolumbar fascia, anterior iliac crest, lateral half of inguinal ligament
I: Linea alba, public crest, ribs 10-12 inferior surface
N: lower 5 thoracic nerves, subcostal, iliohypogastric nerve
A: flex and rotate the trunk, laterally rotate the trunk, compress abdominal contents

Question 3

Transverse abdominis

Answer 3

O: thoracolumbar fascia, iliac crest, lateral 1/3 of the inguinal ligament, internal surface of costal cartilages 7-12
I: linea alba, pubic crest, public symphysis
N: lower 5 thoracic nerves, subcostal, iliohypogastric nerves
A: compress and support abdominal viscera

Question 4

Rectus abdominis

Answer 4

O: pubic symphysis, pubic crest
I: xiphoid process, 5-7th costal cartilages
N: lower 5 thoracic nerves, subcostal, iliohypogastric nerves
A: flexes trunk and tenses anterior abdominal wall