nerves and vessels of the lower leg Flashcards Preview

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Flashcards in nerves and vessels of the lower leg Deck (29)
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1
Q

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

A

common fibular nerve

2
Q

what fibers does the common fibular contain?

A

fibers from L4, L5, S1, S2

3
Q

what 2 parts does the common fibular nerve divide into?

A

superficial and deep fibular nerve

4
Q

what are the branches of the common fibular nerve?

A

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

5
Q

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

A

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

6
Q

clinical problems from damage to common fibular nerve (6)

A

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

7
Q

deep fibular nerve contains fibers from?

A

L4, L5, S1

8
Q

where does the deep fibular nerve travel?

A

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

9
Q

what are the 3 branches of the deep fibular nerve?

A

1 muscular- muscles ant leg and dorsum foot

2 articular- inferior tibiofibular and ankle joints

3 cutaneous- skin webspace 1st and 2nd digits

10
Q

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

A

popliteal artery

11
Q

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

A

an opening in the proximal portion of the interosseus membrane

12
Q

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

A

dorsal pedis artery

13
Q

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

A

superficial fibular nerve

14
Q

the superficial fibular nerve contains fibers from?

A

L4, L5, S1

15
Q

where does the superficial fibular nerve travel?

A

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

16
Q

what are the 2 branches of the superficial fibular nerve?

A

1 motor- fibularis longus and brevis

2 cutaneous- skin ant leg and dorsum foot

17
Q

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

A

superficial fibular nerve

18
Q

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

A

tibial nerve

19
Q

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

A

medial and lateral plantar nerve

20
Q

where does the tibial nerve travel?

A

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

21
Q

what is the segmental innervation of the tibial nerve?

A

L4-S3

22
Q

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

A

1 motor supply to posterior leg

2 sural nerve

3 medial calcaneal

4 articular supply to knee and ankle joints

23
Q

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

A

posterior tibial artery

24
Q

what does the posterior tibial artery divide into?

A

medial and lateral plantar arteries

25
Q

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

A

fibular artery

26
Q

muscles of the foot are supplied by which nerves?

A

medial and lateral plantar, deep fibular

27
Q

the medial plantar supplies which foot muscles?

A

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

28
Q

lateral plantar nerve supplies which foot muscles?

A

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

29
Q

deep fibular nerve supplies

A

extensor digitorum brevis, extensor hallicus brevis