Lateral Cutaneous Nerve of Thigh Flashcards

Study the lateral cutaneous nerve of the thigh, including its lumbar plexus origin, anatomical course, sensory distribution, and entrapment.

Card 1 of 26Question

From which nerve plexus does the lateral cutaneous nerve of the thigh arise?

The lumbar plexus.

In This Section

1. From which nerve plexus does the lateral cutaneous nerve of the thigh arise?

The lumbar plexus.

2. Which spinal nerve roots form the lateral cutaneous nerve of the thigh?

L2 and L3.

3. From which divisions of the lumbar plexus does the lateral cutaneous nerve of the thigh arise?

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

4. What is another name for the lateral cutaneous nerve of the thigh?

The lateral femoral cutaneous nerve.

5. Is the lateral cutaneous nerve of the thigh sensory, motor, or mixed?

A purely sensory nerve.

6. From which border of psoas major does the lateral cutaneous nerve of the thigh emerge?

The lateral border of psoas major.

7. Which muscle does the lateral cutaneous nerve of the thigh cross within the iliac fossa?

The iliacus muscle.

8. What is the direction of the lateral cutaneous nerve of the thigh across the iliacus?

Inferolaterally toward the anterior superior iliac spine.

9. Which fascial layer covers the lateral cutaneous nerve of the thigh as it crosses iliacus?

The iliac fascia.

10. Which bony landmark is closely associated with the nerve as it enters the thigh?

The anterior superior iliac spine.

11. How does the lateral cutaneous nerve of the thigh usually pass beneath the inguinal ligament?

It passes deep to the ligament, usually just medial to the anterior superior iliac spine.

12. Which muscle lies near the nerve as it enters the proximal thigh?

The sartorius muscle.

13. Which deep fascial layer does the lateral cutaneous nerve of the thigh pierce to become superficial?

The fascia lata.

14. Into which two principal branches does the lateral cutaneous nerve of the thigh commonly divide?

Anterior and posterior branches.

15. What is the principal sensory territory of the anterior branch?

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

16. What region receives cutaneous innervation from the posterior branch?

The skin over the upper lateral thigh, including the region near the greater trochanter.

17. Does the lateral cutaneous nerve of the thigh supply any skeletal muscles?

No, it has no motor supply to skeletal muscles.

18. What is the relationship of the lateral cutaneous nerve of the thigh to the femoral nerve?

Both arise from the lumbar plexus, but the lateral cutaneous nerve courses farther laterally across iliacus.

19. What anatomical variation can occur near the nerve's passage through the inguinal region?

Its course may vary, passing through the inguinal ligament or near the anterior superior iliac spine.

20. What is meralgia paresthetica?

A sensory neuropathy caused by compression or irritation of the lateral cutaneous nerve of the thigh.

21. Where does entrapment of the lateral cutaneous nerve of the thigh commonly occur?

Near the inguinal ligament and anterior superior iliac spine.

22. What sensory symptoms commonly occur in meralgia paresthetica?

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

23. Why does isolated lateral cutaneous nerve entrapment not cause muscle weakness?

The nerve contains sensory fibers without motor fibers supplying skeletal muscle.

24. Which external mechanical factor can compress the lateral cutaneous nerve near the inguinal ligament?

Tight belts or restrictive clothing around the waist.

25. Which surgical region places the lateral cutaneous nerve of the thigh at risk of injury?

The anterior hip and iliac crest region, particularly near the anterior superior iliac spine.

26. What clinical finding helps distinguish isolated lateral cutaneous nerve injury from femoral nerve injury?

Anterolateral thigh sensory loss with preserved quadriceps strength and patellar reflex.