Lower Limb Nerves

Question 1

Obturator nerve roots

Answer 1

L2-L4

Question 2

Obturator nerve motor function

Answer 2

Obturator externus, pectineus,
adductor longus,
adductor brevis,
adductor Magnus,

Question 3

Obturator nerve sensory function

Answer 3

Skin over medial thigh

Question 4

Femoral nerve roots

Answer 4

L2-L4

Question 5

Femoral nerve motor function

Answer 5

Anterior thigh muscles:
Hip flexors: pectineus, iliac, sartorius
Knee extensors: quadriceps

Question 6

Femoral nerve sensory function

Answer 6

Anteromedial thigh, medial leg and foot (via branches)

Question 7

Which order do the femoral vessels lie?

Answer 7

NAVy
Nerve
Artery
Vein

Question 8

Sciatic nerve roots

Answer 8

L4-S3

Question 9

Sciatic nerve motor function:

Answer 9

muscles of posterior thigh, adductor portion of adductor magnus

Question 10

Where does the sciatic nerve enter the gluteal region?

Answer 10

Via greater sciatic foramen

Question 11

Where does the sciatic nerve terminate and what does it become?

Answer 11

Apex of popliteal fossa

Tibial and common fibular nerves

Question 12

Where are IM injections given in the gluteal region to avoid damage to the sciatic nerve?

Answer 12

Upper lateral quadrant

Question 13

Tibial nerve roots

Answer 13

L4-S3

Question 14

Tibial nerve sensory function

Answer 14

Skin on posterolateral leg, lateral foot, plantar surface of foot

Question 15

Tibial nerve motor function

Answer 15

Posterior leg comparment

Question 16

How does the tibial nerve enter the foot?

Answer 16

Posterior to medial malleolus, through the tarsal tunnel

Question 17

How does the tibial nerve descend the leg?

Answer 17

Posterior to the tibia

Question 18

What would be the result of damage to the tibial nerve

Answer 18

Loss of plantar flexion
Loss of toe flexion
Weakened inversion

Question 19

Common fibular nerve roots

Answer 19

L4-S3

Question 20

Common fibular nerve motor function

Answer 20

Short head of biceps femoris, muscles in lateral and anterior leg

Question 21

Common fibular nerve sensory function

Answer 21

Skin over posterolateral, anterolateral leg and dorsum of foot

Question 22

How does the common fibular nerve enter the lateral leg?

Answer 22

Wraps around the neck of the fibula. Here, it bifurcates into superficial and deep fibular nerves

Question 23

When is the common fibular nerve most commonly damaged?

Answer 23

Fracture of the fibula

Question 24

How would a patient present if they had damaged the common fibular nerve?

Answer 24

Loss of dorsiflexion - foot appears permanently plantarflexed = “foot drop”
Loss of sensation over dorsum of foot, lateral leg