MCQ Quiz

1. The lumbar plexus is formed by the anterior rami of which spinal nerves?

T12–L3

L1–L4

L2–L5

L3–S1

Explanation:
The lumbar plexus is formed by L1–L4 anterior rami (sometimes with T12 contribution).

2. The lumbar plexus lies within which muscle?

Quadratus lumborum

Iliacus

Psoas major

Psoas minor

Explanation:
The lumbar plexus is embedded within the substance of the psoas major muscle.

3. Which nerve supplies the skin over the anterior abdominal wall above the inguinal ligament?

Iliohypogastric nerve

Ilioinguinal nerve

Genitofemoral nerve

Femoral nerve

Explanation:
Iliohypogastric nerve supplies skin above the inguinal ligament and suprapubic region.

4. The cremasteric reflex is mediated by which nerve?

Ilioinguinal nerve

Genital branch of genitofemoral nerve

Femoral nerve

Obturator nerve

Explanation:
The genital branch of the genitofemoral nerve supplies the cremaster muscle.

5. Which nerve supplies the adductor muscles of the thigh?

Femoral nerve

Sciatic nerve

Superior gluteal nerve

Obturator nerve

Explanation:
Obturator nerve supplies the medial (adductor) compartment of the thigh.

6. The femoral nerve emerges from the lateral border of which muscle?

Psoas major

Iliacus

Quadratus lumborum

Adductor longus

Explanation:
The femoral nerve emerges from the lateral border of psoas major.

7. The femoral nerve enters the thigh by passing:

Through obturator canal

Below inguinal ligament medial to femoral artery

Below inguinal ligament lateral to femoral artery

Through femoral canal

Explanation:
Femoral nerve passes below the inguinal ligament lateral to the femoral artery.

8. The largest cutaneous branch of the femoral nerve is:

Anterior cutaneous nerve of thigh

Saphenous nerve

Medial femoral cutaneous nerve

Lateral femoral cutaneous nerve

Explanation:
The saphenous nerve is the longest and largest cutaneous branch of the femoral nerve.

9. Injury to the femoral nerve causes loss of:

Hip adduction

Hip extension

Foot dorsiflexion

Knee extension

Explanation:
Femoral nerve supplies quadriceps femoris, essential for knee extension.

10. The sacral plexus is formed by anterior rami of:

L4–S4

L5–S3

S1–S5

L3–S2

Explanation:
Sacral plexus is formed by L4–S4 anterior rami.

11. The sacral plexus lies anterior to which muscle?

Piriformis

Obturator internus

Piriformis (on pelvic surface)

Gluteus medius

Explanation:
Sacral plexus lies on the pelvic surface of the piriformis muscle.

12. The sciatic nerve leaves the pelvis through which foramen?

Lesser sciatic foramen

Obturator foramen

Greater sciatic foramen above piriformis

Greater sciatic foramen below piriformis

Explanation:
Sciatic nerve exits via greater sciatic foramen below piriformis.

13. The sciatic nerve is composed of which two nerves?

Tibial and common peroneal

Femoral and obturator

Sural and tibial

Deep and superficial peroneal

Explanation:
Sciatic nerve consists of tibial and common peroneal components.

14. The nerve most commonly injured in posterior hip dislocation is:

Femoral nerve

Sciatic nerve

Obturator nerve

Superior gluteal nerve

Explanation:
Sciatic nerve lies posterior to the hip joint and is commonly injured.

15. The common peroneal nerve winds around which structure?

Medial malleolus

Soleus muscle

Popliteal artery

Neck of fibula

Explanation:
The common peroneal nerve winds around the neck of the fibula.

16. Injury to the common peroneal nerve leads to:

Foot drop

Loss of plantar flexion

Loss of knee extension

Loss of hip adduction

Explanation:
Common peroneal nerve injury causes loss of dorsiflexion → foot drop.

17. The tibial nerve supplies which compartment of the leg?

Posterior

Medial

Explanation:
Tibial nerve supplies the posterior compartment of the leg.

18. The superior gluteal nerve supplies all EXCEPT:

Gluteus medius

Gluteus maximus

Gluteus minimus

Tensor fasciae latae

Explanation:
Gluteus maximus is supplied by the inferior gluteal nerve.

19. A positive Trendelenburg sign indicates paralysis of:

Adductors

Gluteus maximus

Hamstrings

Gluteus medius and minimus

Explanation:
Gluteus medius and minimus stabilize the pelvis during walking.

20. The pudendal nerve leaves the pelvis through:

Greater sciatic foramen then enters via lesser sciatic foramen

Obturator canal

Femoral canal

Directly through pelvic floor

Explanation:
Pudendal nerve exits via greater sciatic foramen and re-enters through lesser sciatic foramen.

21. The pudendal nerve supplies:

Lower limb muscles

Gluteal region

Perineum and external genitalia

Pelvic viscera only

Explanation:
Pudendal nerve is the chief somatic nerve of the perineum.

22. Damage to the obturator nerve produces difficulty in:

Hip extension

Thigh adduction

Knee extension

Foot dorsiflexion

Explanation:
Obturator nerve injury causes weakness of thigh adduction.

17# Lumbosacral Plexus

1. The lumbar plexus is formed by the anterior rami of which spinal nerves?

2. The lumbar plexus lies within which muscle?

3. Which nerve supplies the skin over the anterior abdominal wall above the inguinal ligament?

4. The cremasteric reflex is mediated by which nerve?

5. Which nerve supplies the adductor muscles of the thigh?

6. The femoral nerve emerges from the lateral border of which muscle?

7. The femoral nerve enters the thigh by passing:

8. The largest cutaneous branch of the femoral nerve is:

9. Injury to the femoral nerve causes loss of:

10. The sacral plexus is formed by anterior rami of:

11. The sacral plexus lies anterior to which muscle?

12. The sciatic nerve leaves the pelvis through which foramen?

13. The sciatic nerve is composed of which two nerves?

14. The nerve most commonly injured in posterior hip dislocation is:

15. The common peroneal nerve winds around which structure?

16. Injury to the common peroneal nerve leads to:

17. The tibial nerve supplies which compartment of the leg?

18. The superior gluteal nerve supplies all EXCEPT:

19. A positive Trendelenburg sign indicates paralysis of:

20. The pudendal nerve leaves the pelvis through:

21. The pudendal nerve supplies:

22. Damage to the obturator nerve produces difficulty in: