nerves and vessels of the lower leg

Question 1

which is the smallest of the 2 branches of the sciatic nerve?

Answer 1

common fibular nerve

Question 2

what fibers does the common fibular contain?

Answer 2

fibers from L4, L5, S1, S2

Question 3

what 2 parts does the common fibular nerve divide into?

Answer 3

superficial and deep fibular nerve

Question 4

what are the branches of the common fibular nerve?

Answer 4

1 sural communicating- joins sural branch tibia and helps supply skin on the posterior aspect of the leg

2 lateral sural cutaneous- skin on prox lat posterior leg

3 articular- knee joint

Question 5

what are the common ways to injure the common fibular nerve? (5)

Answer 5

1 plaster casts

2 fractures at proximal end of fibula

3 prolonged kneeling or squatting

4 prolonged kneeling with crossed legs

5 stretched when knee joint is injured

Question 6

clinical problems from damage to common fibular nerve (6)

Answer 6

1 all anterior and lateral leg muscles may be involved

2 loss of dorsiflexion- foot drop

3 loss of eversion

4 loss of extension of toes

5 diminished foot inversion

6 loss of sensation over dorsum foot or lat leg

Question 7

deep fibular nerve contains fibers from?

Answer 7

L4, L5, S1

Question 8

where does the deep fibular nerve travel?

Answer 8

arises at the neck of the fibula and descends with the anterior tibial artery into the anterior compartment of the leg

Question 9

what are the 3 branches of the deep fibular nerve?

Answer 9

1 muscular- muscles ant leg and dorsum foot

2 articular- inferior tibiofibular and ankle joints

3 cutaneous- skin webspace 1st and 2nd digits

Question 10

the anterior tibial artery is a smaller terminal branch of what?

Answer 10

popliteal artery

Question 11

the anterior tibial artery begins at the lower portion of the popliteal fossa and passes through?

Answer 11

an opening in the proximal portion of the interosseus membrane

Question 12

the anterior tibial artery becomes superficial on the dorsum of the foot as?

Answer 12

dorsal pedis artery

Question 13

the lateral terminal branch of the common fibular nerve is the?

Answer 13

superficial fibular nerve

Question 14

the superficial fibular nerve contains fibers from?

Answer 14

L4, L5, S1

Question 15

where does the superficial fibular nerve travel?

Answer 15

lateral leg through fibularis longus and brevis and extensor digitorum longus to distal end of leg

Question 16

what are the 2 branches of the superficial fibular nerve?

Answer 16

1 motor- fibularis longus and brevis

2 cutaneous- skin ant leg and dorsum foot

Question 17

ankle sprains may cause a traction injury to which nerve? possibly parasthesia as well

Answer 17

superficial fibular nerve

Question 18

which nerve crosses the popliteal fossa, superficial to the popliteal artey and vein?

Answer 18

tibial nerve

Question 19

as the tibial nerve enters the plantar surface of the foot it divides into?

Answer 19

medial and lateral plantar nerve

Question 20

where does the tibial nerve travel?

Answer 20

deep to the soleus, behind the malleolus, between the flexor digitorum and flexor hallicus longus

Question 21

what is the segmental innervation of the tibial nerve?

Answer 21

L4-S3

Question 22

what are the branches of the tibial nerve? (4)

Answer 22

1 motor supply to posterior leg

2 sural nerve

3 medial calcaneal

4 articular supply to knee and ankle joints

Question 23

what is the larger of the 2 terminal branches of the popliteal artery?

Answer 23

posterior tibial artery

Question 24

what does the posterior tibial artery divide into?

Answer 24

medial and lateral plantar arteries

Question 25

what is the largest and most important branch of the posterior tibial artery?

Answer 25

fibular artery

Question 26

muscles of the foot are supplied by which nerves?

Answer 26

medial and lateral plantar, deep fibular

Question 27

the medial plantar supplies which foot muscles?

Answer 27

abductor hallicus, flexor digitorum brevis, flexor hallicus brevis, 1st lumbrical

Question 28

lateral plantar nerve supplies which foot muscles?

Answer 28

quadratus plantae, abductor digiti minimi, flexor digiti minimi, adductor hallicus, 2-4 lumbricals, interossei muscles

Question 29

deep fibular nerve supplies

Answer 29

extensor digitorum brevis, extensor hallicus brevis