Beginner External Oblique Quiz

Q1. Which abdominal wall muscle is the most superficial of the three flat muscles?

• Rectus abdominis
• External oblique
• Internal oblique
• Transversus abdominis

Q2. From which ribs does the external oblique arise?

• Ribs 10 through 12 only
• Ribs 5 through 12
• Ribs 1 through 4
• First rib only

Q3. What is the general direction of most external oblique muscle fibers?

• Horizontally
• Vertically upward
• Superomedially
• Inferomedially

Q4. Which structure lies immediately deep to external oblique over much of the lateral abdominal wall?

• Rectus femoris
• Psoas major
• Internal oblique
• Diaphragm

Q5. What is a major bilateral action of the external oblique muscles?

• Extension of the knee
• Plantarflexion of the foot
• Abduction of the shoulder
• Flexion of the trunk and compression of abdominal contents

Q6. What rotational action is produced by unilateral external oblique contraction?

• Rotation of the femur only
• No rotational action
• Ipsilateral trunk rotation only
• Contralateral trunk rotation

Q7. Which fibrous midline structure receives fibers from the external oblique aponeurosis?

• Nuchal ligament
• Linea aspera
• Linea alba
• Cruciate ligament

Q8. The inferior border of the external oblique aponeurosis forms which major landmark?

• Inguinal ligament
• Anterior longitudinal ligament
• Broad ligament
• Sacrotuberous ligament

Q9. Which opening is found in the external oblique aponeurosis?

• Deep inguinal ring
• Superficial inguinal ring
• Femoral ring
• Aortic hiatus

Q10. Which nerves primarily supply the external oblique?

• Phrenic nerves
• Femoral nerves
• Thoracoabdominal nerves from lower thoracic anterior rami
• Vagus nerves