MSK-Lower limb

Question 1

Describe the femoral nerve. ie motor + sensory function

Answer 1

Originates from lumbar plexus (L2-L4)
Motor branches innervate pectineus, sartorius, illiacus + quads femoris.
Sensory branches are medial femoral cutaneous nerve and intermediate cutaneous nerve which innervate anterior + medial thigh. Medial aspect of lower leg and foot.

Question 2

Damage to which nerve and muscle would lead to loss of knee extension

Answer 2

Femoral nerve

Question 3

Describe the obturator nerve

Answer 3

Motor supply to medial compartment of thigh

Question 4

What nerve supplies the lateral aspect of the foot?

Answer 4

Sural nerve

Question 5

Which ligament is likely to be sprained in ankle inversion injuries?

Answer 5

Anterior talofibular ligament

Question 6

What would L3-4 nerve root compression cause?

Answer 6

Sensory loss over anterior thigh
Weak quadriceps
Reduced knee reflex
Positive femoral stretch test

Question 7

What would L5 nerve root compression cause?

Answer 7

Sensory loss dorsum of foot
Weakness in foot and big toe dorsiflexion
Reflexes intact
Positive sciatic nerve stretch test

Question 8

What would S1 nerve root compression cause?

Answer 8

Sensory loss posterolateral aspect of leg and lateral aspect of foot
Weakness in plantar flexion of foot
Reduced ankle reflex
Positive sciatic nerve stretch test

Question 9

If a patient develops a foot drop after a fibular neck fracture what nerve is likely damaged?

Answer 9

common peroneal

Question 10

What would obturator nerve damage cause?

Answer 10

Weakness of leg adduction and pain in groin

Question 11

What passes above the piriformis?

Answer 11

Superior gluteal vessels