Beginner External Oblique Quiz

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

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

Q2. From which ribs does the external oblique arise?

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

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

• Vertically upward
• Inferomedially
• Horizontally
• Superomedially

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

• Internal oblique
• Rectus femoris
• Psoas major
• Diaphragm

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

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

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

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

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

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

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

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

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

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

Q10. Which nerves primarily supply the external oblique?

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