Anatomy: Innervation of the Lower Limb

Question 1

Name the nerve which supplies the skin on middle part of medial thigh

Answer 1

Cutaneous branch of the obturator nerve

Question 2

Name the motor functions of the obturator nerve

Answer 2

Innervates the muscles of the medial thigh - the obturator externus, adductor longus, adductor brevis, adductor magnus and gracilis

Question 3

The lateral cutaneous nerve of the thigh is a branch of which nerve?

Answer 3

Lumbar plexus

Question 4

Name the nerve roots which make up the superior gluteal nerve

Answer 4

L4-S1

Question 5

Name the motor functions of the nerve to obturator internus

Answer 5

Supplies superior gemellus and obturator internus

Question 6

Name the nerve roots which make up the nerve to obturator internus

Answer 6

L5-S2

Question 7

Name the nerve roots which make up the femoral nerve

Answer 7

L2-L4

Question 8

Which division of the common fibular nerve supplies the muscle of the lateral compartment of the leg and skin/fascia of the dorsum of the foot?

Answer 8

Superficial fibular nerve

Question 9

Which nerve supplies the majority of the skin of the first interdigital cleft in the foot?

Answer 9

Deep fibular nerve

Question 10

Name the nerve roots which make up the nerve to quadratus femoris

Answer 10

L4-S1

Question 11

Name the motor functions of the pudendal nerve

Answer 11

Innervates various pelvic muscles, the external urethral sphincter and external anal sphincter

Question 12

Name the nerve roots which make up the sciatic nerve

Answer 12

L4-S3

Question 13

Which areas of the skin are indirectly innervated by the sciatic nerve via its terminal branches?

Answer 13

The skin of the lateral leg, heel, and both the dorsal and plantar surfaces of the foot

Question 14

Name the nerve roots which make up the inferior gluteal nerve

Answer 14

L5-S2

Question 15

Which muscles of the lower limb are supplied by the sciatic nerve?

Answer 15

Muscles of the posterior thigh and the hamstring portion of the adductor magnus, indirectly innervates (via terminal branches) all the muscles of the leg and foot

Question 16

Which nerve supplies the majority of the skin of the plantar surface of the foot (heel and majority of sole)?

Answer 16

Tibial nerve (medial and lateral plantar nerves)

Question 17

Name the motor functions of the inferior gluteal nerve

Answer 17

Supplies gluetus maximus

Question 18

Where does the sciatic nerve most commonly divide?

Answer 18

At the superior apex of the popliteal fossa

Question 19

Which nerve supplies the majority of the skin of the proximal medial border of the dorsum of the foot?

Answer 19

Saphenous nerve

Question 20

Branches of which nerves supply the skin of the leg and foot?

Answer 20

Femoral, sciatic and tibial

Question 21

Which nerve is vunerable to compression injury against the neck of the fibula (e.g. in a tight plaster cast), or in fractures of the fibular neck?

Answer 21

Common fibular nerve

Question 22

Which nerve supplies the majority of the skin of the proximal lateral border of the plantar surface of the foot?

Answer 22

Sural nerve

Question 23

Where should gluteal IM injections be given to avoid the sciatic nerve?

Answer 23

In the upper lateral quadrant of the gluteal region

Question 24

Name the sensory functions of the pudendal nerve

Answer 24

Innervates the external genitalia of both sexes and the skin around the anus, anal canal and perineum

Question 25

Name the motor functions of the superior gluteal nerve

Answer 25

Supplies gluetus medius and minumus

Question 26

Name the principle nerve of the perineum

Answer 26

Pudendal nerve

Question 27

Name the nerve which supplies the skin of the inferior half of the buttock, the skin of the posterior thigh and the skin of the popliteal fossa

Answer 27

Posterior cutaneous nerve of the thigh

Question 28

Name the artery which supplies the sciatic nerve

Answer 28

Artery to the sciatic nerve

Question 29

Name the nerve which supplies the skin on anterior and lateral aspects of the thigh down to the knee

Answer 29

Lateral cutaneous nerve of the thigh

Question 30

Name the motor functions of the nerve to quadratus femoris

Answer 30

Supplies hip joint, inferior gemellus and quadratus femoris

Question 31

Name the nerve roots which make up the obturator nerve

Answer 31

L2-L4

Question 32

Which division of the common fibular nerve supplies the muscles of the anterior compartment of the leg and the skin of the first interdigital cleft?

Answer 32

Deep fibular nerve

Question 33

Name the sensory functions of the femoral nerve

Answer 33

Innervates the skin on the anterior thigh and the medial leg

Question 34

Name the two branches of the sciatic nerve when it divides, usually in the region of the popliteal fossa

Answer 34

Tibial nerve and common fibular nerve

Question 35

Name the nerve which supplies the skin on anterior and medial aspects of the thigh

Answer 35

Anterior cutaneous nerve of the thigh

Question 36

Name the motor functions of the femoral nerve

Answer 36

Innervates the muscles of the anterior thigh - the illiacus, pectineus, sartorius and quadriceps femoris

Question 37

Name the two divisions of the common fibular nerve

Answer 37

Deep and superficial fibular nerves

Question 38

Name the nerve roots which make up the pudendal nerve

Answer 38

S2-S4

Question 39

Which nerve supplies the majority of the skin on the dorsum of the foot?

Answer 39

Mainly superficial fibular nerve

Question 40

The anterior cutaneous nerve of the thigh is a branch of which nerve?

Answer 40

Femoral nerve

Question 41

Name the two lines which divide the quadrants of the gluteal region

Answer 41

Greater trochanter to PSIS, midpoint of iliac crest