Nerves of the Lower Limb

Question 1

Which nerve supplies gluteus medius and minimus?

Answer 1

Superior gluteal nerve

Question 2

Branching of the lumbar plexus occurs within which muscle?

Answer 2

Psoas major

Question 2

What nerve roots contribute to the sacral plexus

Answer 2

Part of L4 and L5 (called the lumbosacral trunk)

S1-4

Question 3

What nerve roots make up the obturator nerve?

Answer 3

Anterior divisions of L2,3,4

Question 3

Describe the course of the common fibular nerve

Answer 3

It follows the head of biceps laterally (running on its medial side)

Runs superficial to the lateral head of the gastrocnemius

Winds around the neck of the fibula

Enters fibularis longus

Question 4

Which nerve roots make contribute the tibial nerve?

Answer 4

L4,5 and S1-3 - anterior divisions`

Question 4

What is the sensory supply of the deep fibular nerve?

Answer 4

Cleft of 1st toe

Question 5

What is the sensory supply of the superficial fibular nerve?

Answer 5

Lower lateral leg

Dorsum of foot

Question 7

What do L1 fibres innervate?

Answer 7

Skin of the inguinal area, groin and scrotum

Question 9

Describe the course of the femoral nerve

Answer 9

Emerges on the lateral border of psoas

Goes under the inguinal ligament

Divides into terminal branches 1 inch after inguinal ligament

Question 10

Is the femoral nerve in the femoral sheath?

Answer 10

No

Question 11

What is the motor supply of the deep fibular nerve?

Answer 11

EHL

Tibialis anterior

EDL

ED brevis

Question 12

Which nerve supplies the gluteus maximus?

Answer 12

The inferior gluteal nerve

Question 12

What is the sensory innervation of the tibial nerve (name the specific branches)?

Answer 12

Posterior leg - sural nerve

Sole of the foot

Question 13

What is endangered in a neck of tibia fracture?

Answer 13

The common tibial nerve

Question 14

Does the common fibular nerve have a motor supply?

Answer 14

No, splits into deep and superficial branches that do

Question 15

Describe the course of the sciatic nerve

Answer 15

It emerges beneath the piriformis muscle

Travels posterior to the thigh

Descends in the posterior thigh underneath biceps

Splits into terminal branches a the popliteal fossa

Question 16

Pain from which structure can be referred to the inferiomedial patch of skin in the thigh?

Answer 16

The pelvic peritoneum

Question 16

Which nerve supplies the skin on the posterior aspect of the thigh?

Answer 16

The posterior cutaneous nerve of the thigh

Question 17

What is the course of obturator nerve?

Answer 17

Comes out at the medial border of psoas

Travels through the obturator canal

Enters the medial compartment of the thigh

Question 18

Which nerve roots contribute to the femoral nerve?

Answer 18

Posterior divisions of L2,3,4

Question 18

What is the sensory innervation of the obturator nerve?

Answer 18

Inferiomedial aspect of the thigh

Question 19

What is the motor supply of the sciatic nerve?

Answer 19

Hamstrings - the tibial component of the nerve does all them except the short head of the biceps which is by the common fibular component

Question 20

What is the motor supply of the tibial nerve?

Answer 20

Muscles of the posterior compartment of leg and sole of foot

Question 22

Which nerves of the lumber plexus emerge from the medial aspect of Psoas?

Answer 22

Genitofemoral nerve

Question 23

What is the sural nerve only tibial nerve?

Answer 23

No, also gets a contribution from the common fibular nerve

Question 25

What structural feature means that pregnant women and obese people something get tingling on the lateral thigh?

Answer 25

The lateral cutaneous nerve of the thigh runs close to the ASIS and can get wedged against it

Question 25

What is the sensory supply of the femoral nerve and the name of the branches that supply them.

Answer 25

Anteriomedial thigh - medial and intermediate cutaneous branches of the thigh Medial aspect of knee, leg and ankle - saphenous nerve

Question 26

Which nerve root contribute to the sciatic nerve?

Answer 26

L4,5 and S1-3 - anterior and posterior branches

Question 28

What is the course and branches of the genitofemoral nerve?

Answer 28

Comes out onto the anterior compartment of psoas major Branches into the femoral branch and genital branch

Question 29

What is the motor innervation the femoral nerve?

Answer 29

Quadraceps Sartorius Pectineus (also receives supply from medial compartment)

Question 30

What are the effects of severing the iliohypogastric nerve and ilioinguinal nerve?

Answer 30

Increased chance of inguinal herniation due to loss of the ability to contract the roof of the canal during abdo wall contraction (and increased intra-abdominal pressure)

Question 31

Describe the course of the tibial nerve

Answer 31

Its descent is continuous with that of the sciatic nerve - through the popliteal fossa Beneath the fibrous arch of the soleus Descends between the post. and ant compartments of the leg Hooks posterior to the medial malleolus Onto the sole of the foot

Question 33

How does the femoral nerve supply the muscles of the anterior compartment of the thigh?

Answer 33

Sends an individual branch to each muscle

Question 34

Which spinal root contribute to the lumbar plexus?

Answer 34

Ventral rami of L1-L4

Question 35

Which nerves of the lumber plexus emerge from the medial border of Psoas?

Answer 35

Obturator nerve

Question 36

What does the genitofemoral nerve supply?

Answer 36

Supplies the area of skin directly beneath the inguinal ligament, over the femoral triangle

Question 37

Which nerve supplies the muscles of the lateral compartment of the leg?

Answer 37

Superficial fibular nerve

Question 38

Which nerves of the lumber plexus emerge from the lateral border of Psoas?

Answer 38

Ilioinguinal and Iliohypogastric Lateral cutaneous nerve of the thigh Femoral nerve

Question 40

What are the terminal branches of the sciatic nerve?

Answer 40

The common fibular The tibial

Question 41

On what muscle does the sacral plexus form?

Answer 41

The piriformis

Question 42

Which nerves of the lumbar plexus run on top of the iliacus muscle?

Answer 42

Lateral cutaneous nerve of thigh Femoral nerve

Question 43

Why does IM injection given in the lateral thigh now, instead of the superiolateral gluteal region as previous?

Answer 43

Because there is risk that the sciatic nerve splits early and common fibular nerve can come out above the piriformis and be close to that part of the gluteal region

Question 44

How does a damaged common fibular nerve present?

Answer 44

Dropped foot - inability to dorsiflex, extend or evert the foot

Question 45

Which nerve roots contribute the common fibular nerve?

Answer 45

L4-5 and S1-2 posterior divisions

Question 46

Which nerve roots contribute to the lateral cutaneous nerve of the thigh?

Answer 46

L2 and L3

Question 47

What does the ilioinguinal and iliohypogastric nerves supply?

Answer 47

Structures on the posterior abdo wall Lower fibres of transversis abdominis and internal oblique

Question 48

Which muscles does the obturator nerve supply?

Answer 48

The adductors and part of pectineus