Beginner Internal Oblique Quiz

Q1. Where is the internal oblique located among the three flat abdominal muscles?

• Between external oblique and transversus abdominis
• Superficial to external oblique
• Deep to transversalis fascia
• Inside rectus abdominis

Q2. What is the general direction of the upper fibers of internal oblique?

• Inferomedially
• Strictly horizontally
• Vertically downward only
• Superomedially

Q3. Which structure provides an important inferior attachment for internal oblique?

• Inguinal ligament
• Anterior longitudinal ligament
• Patellar ligament
• Sacrotuberous ligament

Q4. Which bony structure provides a major attachment for internal oblique?

• Mandible
• Iliac crest
• Femoral shaft
• Scapular spine

Q5. What is a major bilateral action of internal oblique?

• Shoulder abduction
• Trunk flexion and abdominal compression
• Knee extension
• Ankle dorsiflexion

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

• No trunk rotation
• Contralateral trunk rotation
• Ipsilateral trunk rotation
• Rotation of the thigh only

Q7. Which muscle lies immediately deep to internal oblique over much of the lateral abdominal wall?

• Rectus femoris
• Pectoralis major
• Transversus abdominis
• External oblique

Q8. Which nerves supply the internal oblique?

• Vagus nerves only
• Phrenic nerves only
• Femoral nerves only
• Lower thoracoabdominal nerves and L1

Q9. Which inguinal structure receives fibers derived mainly from internal oblique?

• External spermatic fascia
• Internal spermatic fascia
• Tunica vaginalis
• Cremaster muscle and fascia

Q10. Which midline fibrous structure receives fibers from the internal oblique aponeurosis?

• Ligamentum flavum
• Linea alba
• Iliotibial tract
• Linea aspera