Muscles Of The Anterior Abdominal Wall

Question 1

External oblique

Answer 1

O: ribs 5-12
I: iliac crest, pubis
A: compresses abdominal wall, laterally rotates waist
N: intercostal nerves from T7-T12

Question 2

Internal oblique

Answer 2

O: ingunial ligament, iliac crest
I: pubis, ribs 10-12
A: compresses abdominal wall, laterally rotates waist
N: intercostal nerves from T7-T12 and spinal nerve L1

Question 3

Transverse abdominis

Answer 3

O: ingunial ligament, iliac crest, costal cartilages 7-12
I: Linea alba, pubis
A: compresses abdominal wall, laterally rotates waist
N: intercostal nerves from T7-T12, spinal nerve L1

Question 4

Rectus abdominus

Answer 4

O: crest of pubis, pubic symphysis
I: costal cartilages 5-7, xiphoid process
A: flexes vertebral column, compresses abdominal wall
N: intercostal nerves from T6-T12