Neural pathways

Question 1

What are the nerve roots of the femoral nerve?

Answer 1

L2, L3, L4.

Question 2

What is the pathway of the femoral nerve?

Answer 2

Through psoas major, between iliacus, enters femoral triangle (bounded by sartorius, adductor longus, inguinal ligament).

Question 3

What are the motor branches of the anterior division?

Answer 3

Pectineus, sartorius.

Question 3

How does the femoral nerve divide?

Answer 3

Divides into anterior and posterior divisions.

Question 4

What are the sensory branches of the anterior division?

Answer 4

Medial cutaneous nerve of the thigh, intermediate cutaneous nerve.

Question 5

What is the sensory branch of the posterior division?

Answer 5

Becomes the saphenous nerve.

Question 6

What muscles are innervated by the posterior division?

Answer 6

Quadriceps (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius).

Question 7

What are the functions of the femoral nerve?

Answer 7

Hip flexion (iliopsoas), knee extension (quadriceps), thigh abduction (sartorius).

Question 8

What is the sensory innervation of the saphenous nerve?

Answer 8

Medial/anterior/posterior medial lower limb, medial calf, medial foot arch.

Question 9

From which nerve does the saphenous nerve branch?

Answer 9

Femoral nerve.

Question 10

What is the pathway of the saphenous nerve?

Answer 10

Arises in the femoral triangle, passes through the adductor canal, runs along the saphenous vein, and continues to the ankle and foot.

Question 11

What are the nerve roots of the obturator nerve?

Answer 11

L2, L3, L4.

Question 12

What is the pathway of the obturator nerve?

Answer 12

Travels along the iliopectineal line, descends through psoas major, and passes through the obturator canal.

Question 13

What muscles are innervated by the obturator nerve?

Answer 13

Adductor longus, adductor brevis, gracilis, obturator externus.

Question 14

What are the functions of the obturator nerve?

Answer 14

Hip adduction, medial thigh stabilization, external hip rotation.

Question 15

What are the nerve roots of the radial nerve?

Answer 15

C5-T1.

Question 16

What is the pathway of the radial nerve?

Answer 16

Exits the brachial plexus posteriorly, wraps around the humerus in the radial groove, passes through the cubital fossa, and divides into deep (motor) and superficial (sensory) branches.

Question 17

What is the sensory innervation of the radial nerve?

Answer 17

Posterior arm and forearm, dorsal aspect of lateral 3.5 fingers (except fingertips).

Question 18

What muscles are innervated by the radial nerve?

Answer 18

Triceps brachii, brachioradialis, supinator, extensor carpi radialis, extensor digitorum, extensor pollicis.

Question 19

What are the nerve roots of the median nerve?

Answer 19

C5-T1.

Question 20

What is the sensory innervation of the median nerve?

Answer 20

Palmar aspect of thumb, index, middle, half of ring finger; dorsal aspect of distal thumb and next two fingers.

Question 21

What is the pathway of the median nerve?

Answer 21

Descends alongside the brachial artery, through the carpal tunnel to the hand.

Question 22

What are the nerve roots of the ulnar nerve?

Answer 22

C8-T1.

Question 23

What is the sensory distribution of the ulnar nerve?

Answer 23

Dorsal and palmar aspects of the 5th and medial half of the 4th finger.

Question 24

What is the pathway of the ulnar nerve?

Answer 24

Travels down the medial arm, passes through the cubital tunnel, continues into the hand via Guyon’s canal.

Question 25

What are the nerve roots of the sciatic nerve?

Answer 25

L4-S3.

Question 26

What is the pathway of the sciatic nerve?

Answer 26

Originates from the lumbosacral plexus, passes through the greater sciatic foramen, and divides into tibial and common peroneal nerves.

Question 27

What are the nerve roots of the tibial nerve?

Answer 27

L4-S3.

Question 28

What is the pathway of the tibial nerve?

Answer 28

Passes through the popliteal fossa, beneath the flexor retinaculum, and divides into medial/lateral plantar nerves.