Beginner External Oblique Quiz

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

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

Q2. From which ribs does the external oblique arise?

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

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

• Inferomedially
• Vertically upward
• Horizontally
• Superomedially

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

• Rectus femoris
• Internal oblique
• Psoas major
• Diaphragm

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

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

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

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

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

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

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

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

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

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

Q10. Which nerves primarily supply the external oblique?

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