Question 1

Which nerve is primarily responsible for dorsiflexion of the foot, and what clinical condition results from its damage?

Accepted Answer

Common fibular nerve; Talipes Equinus

Question 2

A patient presents with an inability to plantarflex the foot and a permanent dorsiflexed position. Which nerve is most likely damaged?

Accepted Answer

Tibial nerve

Question 3

Which spinal segments contribute to the formation of the lumbar plexus?

Accepted Answer

T12–L4

Question 4

The sciatic nerve branches into which two major nerves in the lower limb?

Accepted Answer

Tibial and common fibular nerves

Question 5

Which nerve innervates the quadriceps muscle group and provides sensory input to the anteromedial thigh?

Accepted Answer

Femoral nerve

Question 6

A patient has numbness over the superior, medial thigh and weakness in abdominal muscles. Which nerve is most likely affected?

Accepted Answer

Ilioinguinal nerve

Question 7

Which nerve is responsible for innervating the gluteus maximus muscle?

Accepted Answer

Inferior gluteal nerve

Question 8

Damage to which nerve would most likely result in loss of sensation over the perineum and external genitalia?

Accepted Answer

Pudendal nerve

Question 9

Which nerve provides sensory innervation to the skin over the lateral thigh?

Accepted Answer

Lateral femoral cutaneous nerve

Question 10

A patient with a herniated disc at L4–L5 is most likely to experience symptoms in which nerve distribution?

Accepted Answer

Sciatic nerve

Question 11

Which nerve is formed by the ventral rami of L2–L4 and innervates the adductor muscles of the thigh?

Accepted Answer

Obturator nerve

Question 12

Which of the following best describes the distribution of the saphenous nerve?

Accepted Answer

Medial surface of the leg and foot

Question 13

A patient presents with loss of function in the gluteus medius and minimus muscles. Which nerve is most likely damaged?

Accepted Answer

Superior gluteal nerve

Question 14

Which nerve is responsible for the cutaneous sensation of the posterior thigh and leg?

Accepted Answer

Posterior femoral cutaneous nerve

Question 15

If a patient cannot extend their knee and has numbness over the anterior thigh, which nerve is most likely affected?

Accepted Answer

Femoral nerve

Question 16

Which nerve is most likely to be compressed in a patient with meralgia paresthetica (numbness over the lateral thigh)?

Accepted Answer

Lateral femoral cutaneous nerve

Question 17

Which nerve is responsible for innervating the muscles of the perineum and the skin over the external genitalia?

Accepted Answer

Pudendal nerve

Question 18

A patient with foot drop is unable to dorsiflex the foot. Which nerve injury is most likely responsible?

Accepted Answer

Common fibular nerve

Question 19

Which nerve is formed by the ventral rami of S2–S4 and is important for continence?

Accepted Answer

Pudendal nerve

Question 20

Which of the following best describes the function of the sciatic nerve?

Accepted Answer

Branches into the tibial and common fibular nerves to supply the posterior thigh, leg, and foot

The Lumbar and Sacral Plexuses: Structure, Function, and Clinical Correlates

Study Guide - Practice Questions