Topic 9 - Nerve Supply of the Lower Limbs

Question 1

List the nerve roots which comprise the lumbar and lumbosacral plexes

Answer 1

Lumber plexus: L1234

Lumbosacral plexus: L45S123

Question 2

Describe the motor and sensory distribution of the Femoral Nerve

Answer 2

Sensory: Skin of the anterior and medial thigh, knee and hip joints

Motor: Iliacus, pectineus, sartiorius and quadriceps group

Question 3

Describe the motor and sensory distribution of the Obturator nerve

Answer 3

Sensory: Skin of the medial thigh

Motor: Pectineus, adductor brevis, longus, half of magnus, gracilis, obturator externus

Question 4

Describe the motor and sensory distribution of the Lateral Femoral Cutaneous nerve

Answer 4

Sensory: Skin of lateral thigh

Question 5

Describe the motor and sensory distribution of the genitofemoral

Answer 5

Sensory: Skin of medial thigh and external genitalia

Question 6

Describe the motor and sensory distribution of the superior gluteal

Answer 6

Sensory: Hip joint

Motor: Gluteus medius. minimus and tensor facae latae

Question 7

Describe the motor and sensory distribution of the inferior gluteal nerve

Answer 7

Sensory: None

Motor: Gluteus Maximus

Question 8

Describe the motor and sensory distribution of the Siatic nerve

Answer 8

Sensory: None

Motor: Hamstrings and half of Adductor Magnus

Question 9

Describe the motor and sensory distribution of the Posterior Femoral Cutaneous nerve

Answer 9

Sensory: Skin of the posterior thigh and leg to mid calf

Motor: None

Question 10

State the root value of the femoral, obturator and static nerves

Answer 10

Femoral Nerve: L234

Obturator Nerve: L234

Sciatic Nerve: L45S123

Question 11

Describe the sensory and motor distribution of the Saphenous Nerve

Answer 11

Sensory: Skin of the medial leg to base of great toe

Motor: None

Question 12

Describe the sensory and motor distribution of the tibial nerve

Answer 12

Sensory: Knee and ankle joints

Motor: Gastrocs, soleus, plantaris and popliteus

Question 13

Describe the sensory and motor distribution of the Common Perineal

Answer 13

Sensory: Knee joint of anterior, posterior and lateral upper leg

Motor: None

Question 14

Describe the sensory and motor distribution of the Sural Nerve

Answer 14

Sensory: Skin of lateral and posterior leg, heel and skin of lateral side of sole

Question 15

Describe the sensory and motor distribution of the Superficial Perineal Nerve

Answer 15

Sensory: Skin of lateral leg, dorsal of foot

Motor: Peroneus Longus and Brevis

Question 16

Describe the sensory and motor distribution of the Deep Perineal Nerve

Answer 16

Sensory: Skin between digits 1 and 2

Motor: Tibialis Anterior, Extensor Hallucis Longus, Extensor Digitorium Longus and Peroneus Tertius

Question 17

Describe the sensory and motor distribution of the Medial Plantar Nerve

Answer 17

Sensory: Skin of medial 3 and 1/2 digits and corresponding sole

Motor: Abductor hallucis, Flexor Digitorium Brevis, Flexor Hallucis Brevis and 1st lumbrical

Question 18

Describe the sensory and motor distribution of the Lateral Plantar Nerve

Answer 18

Sensory: Skin of lateral 1 and 1/2 digit and corresponding sole

Motor: Abductor digiti minimi, 2nd, 3rd and 4th lumbricals, adductor hallucis, flexor digiti minimi brevis, dorsal and plantar interossei