Lateral Femoral Cutaneous Nerve Flashcards

Trace the lateral femoral cutaneous nerve from the lumbar plexus to the thigh, including its sensory branches and entrapment sites.

Card 1 of 24Question

Which spinal nerve roots form the lateral femoral cutaneous nerve?

The anterior rami of L2 and L3.

In This Section

1. Which spinal nerve roots form the lateral femoral cutaneous nerve?

The anterior rami of L2 and L3.

2. From which nerve plexus does the lateral femoral cutaneous nerve arise?

The lumbar plexus.

3. Which divisions of the lumbar plexus contribute to the lateral femoral cutaneous nerve?

The posterior divisions of the anterior rami of L2 and L3.

4. What is the functional classification of the lateral femoral cutaneous nerve?

A purely sensory somatic nerve.

5. Where does the lateral femoral cutaneous nerve emerge from the psoas major muscle?

At the lateral border of psoas major.

6. Which muscle does the lateral femoral cutaneous nerve cross in the iliac fossa?

The iliacus muscle.

7. In which direction does the lateral femoral cutaneous nerve travel across the iliacus muscle?

Inferolaterally toward the anterior superior iliac spine.

8. What is the relationship of the lateral femoral cutaneous nerve to the iliac fascia during its pelvic course?

It travels deep to the iliac fascia across the anterior surface of iliacus.

9. Which bony landmark is closely associated with the lateral femoral cutaneous nerve as it enters the thigh?

The anterior superior iliac spine.

10. How does the lateral femoral cutaneous nerve usually pass beneath the inguinal ligament?

It passes deep to the ligament near its lateral attachment, usually medial to the anterior superior iliac spine.

11. Which thigh muscle does the lateral femoral cutaneous nerve commonly cross near its proximal course?

The sartorius muscle.

12. What are the two principal terminal branches of the lateral femoral cutaneous nerve?

The anterior and posterior branches.

13. Which region is primarily supplied by the anterior branch of the lateral femoral cutaneous nerve?

The skin of the anterolateral thigh, extending toward the knee.

14. Which region is primarily supplied by the posterior branch of the lateral femoral cutaneous nerve?

The skin of the lateral thigh, including its proximal posterolateral region.

15. Does the lateral femoral cutaneous nerve innervate any skeletal muscles?

No. It provides cutaneous sensation without motor innervation.

16. What condition results from entrapment or compression of the lateral femoral cutaneous nerve?

Meralgia paresthetica.

17. Where is the lateral femoral cutaneous nerve most commonly compressed in meralgia paresthetica?

Near the anterior superior iliac spine as it passes beneath or through the inguinal ligament.

18. What sensory symptoms characterize meralgia paresthetica?

Burning pain, tingling, numbness, or altered sensation over the anterolateral thigh.

19. Why is muscle weakness not expected in isolated lateral femoral cutaneous nerve entrapment?

The nerve contains no somatic motor fibers.

20. Which external factors can compress the lateral femoral cutaneous nerve near the inguinal ligament?

Tight belts, restrictive clothing, or heavy equipment worn around the waist.

21. What anatomical variation can occur in the nerve's relationship to the inguinal ligament?

It may pass through, above, or beneath different portions of the ligament rather than following its usual course.

22. Which pelvic surgical procedure can place the lateral femoral cutaneous nerve at risk near the iliac crest?

Anterior iliac crest bone graft harvesting.

23. How can the lateral femoral cutaneous nerve be distinguished clinically from the femoral nerve?

It supplies only skin sensation, whereas the femoral nerve also provides motor innervation to anterior thigh muscles.

24. Which regional anesthetic procedure selectively targets the lateral femoral cutaneous nerve?

A lateral femoral cutaneous nerve block for anesthesia of the anterolateral thigh skin.