Intermediate Sacral Plexus Quiz

Q1. Which roots form the lumbosacral trunk?

• S3 and S4
• S1 and S2
• L4 and L5
• L1 and L2

Q2. What is the relationship of the sacral plexus to piriformis?

• It lies inside obturator internus
• It lies on the posterior surface of the femur
• It lies within gluteus maximus
• It lies on the anterior surface of piriformis

Q3. Which divisions of the sacral plexus contribute to the tibial component of the sciatic nerve?

• Dorsal rami only
• Anterior divisions
• Sympathetic rami only
• Posterior divisions

Q4. Which divisions contribute to the common fibular component of the sciatic nerve?

• Anterior divisions only
• Gray rami only
• Posterior divisions
• Dorsal rami only

Q5. What are the usual root values of the superior gluteal nerve?

• L4, L5, and S1
• L2 and L3 only
• S2, S3, and S4
• L1, L2, and L3

Q6. What are the usual root values of the inferior gluteal nerve?

• L1 and L2
• L5, S1, and S2
• S3 and S4 only
• L3 and L4

Q7. Which nerve usually exits the greater sciatic foramen superior to piriformis?

• Posterior femoral cutaneous nerve
• Inferior gluteal nerve
• Sciatic nerve
• Superior gluteal nerve

Q8. Which major nerve usually leaves the pelvis inferior to piriformis?

• Obturator nerve
• Sciatic nerve
• Femoral nerve
• Ilioinguinal nerve

Q9. Which sacral plexus branch innervates obturator internus and also supplies superior gemellus?

• Nerve to obturator internus
• Superior gluteal nerve
• Femoral nerve
• Nerve to quadratus femoris

Q10. Which sacral plexus branch supplies quadratus femoris and inferior gemellus?

• Inferior gluteal nerve
• Nerve to obturator internus
• Obturator nerve
• Nerve to quadratus femoris