Lower Extremity Nerves

Question 1

What muscles does the Obturator Nerve innervate and at what levels?

Answer 1

1. Obturator externus (L3, 4)
2. Adductor brevis (L2, 3, 4)
3. Adductor magnus (anterior head) (L2, 3, 4)
4. Adductor longus (L2, 3, 4)
5. Gracilis (L2, 3)

Question 2

What muscles does the femoral nerve innervate and at what levels?

Answer 2

1. Psoas – L2, 3 directly
2. Iliacus (L2, 3)
3. Pectineus (L2, 3)
4. Sartorius (L2, 3)
5. Rectus femoris (L2, 3, 4)
6. Vastus medialis (L2, 3, 4)
7. Vasuts lateralis (L2, 3, 4)
8. Vastus intermedius (L2, 3, 4)

Question 3

What muscles does the Sciatic nerve innervate and at what levels? (Tibial Division and Fibular Division)

Answer 3

Tibial Division:

1. Biceps femoris (long head) (L5, S1, 2)
2. Semitendinosus (L5, S1, 2)
3. Semimembranosus (L5, S1, 2)
4. Adductor magnus (posterior head ) (L4)

Fibular Division:
1. Biceps femoris (short head) (L5, S1, 2)

Question 4

What muscles does the Tibial nerve innervate and at what levels?

Answer 4

1. Plantaris (S1, 2)
2. Popliteus (L4, 5, S1)
3. Gastrocnemius (S1, 2)
4. Soleus (S1, 2)
5. Flexor digitorum longus (S2, 3)
6. Flexor hallucis longus (S2, 3)
7. Tibialis posterior (L4, 5)

Question 5

What muscles does the Superficial Fibular nerve innervate and at what levels?

Answer 5

1. Fibularis longus (L5, S1)

2. Fibularis brevis (L5, S1)

Question 6

What muscles does the Deep fibular nerve innervate and at what levels?

Answer 6

1. Tibialis anterior (L4, 5)
2. Extensor digitorum longus (L5, S1)
3. Extensor hallucis longus (L5, S1)
4. Fibularis tertius (L5, S1)
5. Extensor hallucis brevis (L5, S1)
6. Extensor digitorum brevis (L5, S1)