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PNS exam III - mine > Sacra Plexus - Part 2 > Flashcards

Sacra Plexus - Part 2 Flashcards

1
Q

The perforating cutaneous nerve contains fibers from?

A

S2 and S3

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2
Q

Why is the perforating cutaneous nerve so named?

A

Because it travels through the sacrotuberous ligament

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3
Q

The perforating cutaneous nerve ultimately reaches what area?

A

Lower medial aspect of the buttocks

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4
Q

The perforating cutaneous nerve may be formed alternately by what? Or it could be _____.

A

A branch off the pudendal nerve

absent

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5
Q

The posterior cutaneous nerve of the thigh is formed by what?

A

Anterior division - S2 and S3

Posterior division - S1 and S2

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6
Q

The posterior cutaneous nerve of the thigh leaves the pelvis via what?

A

Greater sciatic foramen

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7
Q

How does the posterior cutaneous nerve of the thigh descend?

A

Posterior thigh and inferior to the leg

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8
Q

The posterior cutaneous nerve of the thigh will ultimately communicate with which nerve?

A

sural nerve

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9
Q

What does the posterior cutaneous nerve supplies?

A

Skin on the posterior and medial thigh

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10
Q

What is the largest nerve in the human body?

A

The sciatic nerve

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11
Q

How large is the sciatic nerve usually?

A

2cm

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12
Q

The sciatic nerve is a combination of what two nerves?

A

Tibial nerve

Common fibular nerve

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13
Q

Which is more laterally located? Tibial or common fibula?

A

common fibular nerve

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14
Q

Which is more medically located? Tibial or common fibula?

A

Tibial nerve

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15
Q

The tibial nerve is from what?

A

The anterior divisions of L4-S3

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16
Q

The common fibular nerve is formed from what?

A

Posterior divisions of L4-S2

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17
Q

The sciatic nerve leaves the pelvis through what?

A

Greater sciatic foramen

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18
Q

What is different about the sciatic nerve in the pelvis and as it leaves the greater sciatic foremen?

A

Enclosed in a common sheath

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19
Q

The sciatic nerve is below what muscle?

A

piriformis

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20
Q

After the sciatic nerve leaves the pelvis it continues to travel inferior on the _______?

A

Posterior aspect of the adductor magnus

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21
Q

What can cause sciatica?

A

Piriformis syndrome

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22
Q

When does the sciatic nerve split into the common fibula and tibial nerve?

A

Usually about 2/3 of the way to the knee, but variable

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23
Q

The common fibula nerve is composed of fibers from what?

A

L4-S2

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24
Q

The common fibular nerve gives off branches to what muscle in the thigh?

A

Biceps femoris (short head)

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25
Q

When does the common fibular nerve give off branches to the biceps femoris (short head) in the thigh?

A

Before separating from the tibial nerve fibers

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26
Q

After separating from the tibial nerve, the common fibular nerve courses around the ____ aspect of what?

A

Lateral

fibula

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27
Q

The common fibula nerve gives off what type of branch and to where?

A

Articular

knee joint

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28
Q

What part of the leg doe the common fibular nerve reach when it gives off the articular branch to the knee joint?

A

antero-lateral aspect of the leg

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29
Q

When are two sensory branches given off by the common fibular nerve?

A

As the nerve courses along the lateral aspect of the popliteal fossa

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30
Q

What are the names of the two sensory branches of the common fibular nerve?

A

Lateral sural branch

Fibular communicating branch

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31
Q

The lateral sural branch supplies what area?

A

Skin on lateral aspect of leg

32
Q

The fibular communicating branch combines with which nerve?

A

Medial sural cutaneous nerve

33
Q

After the fibula communicating branch combines with the medial sural cutaneous nerve, it forms/becomes what nerve?

A

Sural nerve

34
Q

The medial sural cutaneous nerve is from which nerve?

A

Tibial nerve

35
Q

The common fibula nerve then divides what two nerves?

A

Superficial fibular nerve

Deep fibular nerve

36
Q

The superficial fibular nerve travels inferior between what? All the way down to where?

A

fibularis longus
Fibula
dorsum of the foot

37
Q

The superficial fibula nerve supplies what two muscles?

A

Fibularis longus

Fibularis brevis

38
Q

The superficial fibular nerve divides into what?

A

Medial dorsal cutaneous nerve

Intermediate dorsal cutaneous nerve

39
Q

The medial and intermediate dorsal cutaneous nerves supply what area together?

A

Dorsum of the foot EXCEPT the skin between the first two toes.

40
Q

The deep fibular nerve runs inferiorly along what?

A

tibialis anterior

41
Q

The deep fibular nerve supplies what basically?

A

Extension muscles of foot and toes

42
Q

The deep fibular nerve supplies what muscles specifically? (6)

A

Tibialis anterior
Extension digitorum longus and brevis
Extension hallucis longus and brevis
Fibularis tertius

43
Q

The terminal branch of the deep fibular nerve supplies what area a skin?

A

Skin between first two toes

44
Q

What is a clinical consideration for the superficial and deep fibular nerves?

A

Steppage gait

45
Q

What is stoppage gait?

A

Foot drop, causing a high stepping

46
Q

What supplies the anterior compartment of leg?

A

Deep fibular nerve

47
Q

What supplies the lateral compartment of the leg?

A

Superficial fibular nerve

48
Q

Does the tibial nerve supply ALL plantar flexors?

A

NO, because the fibularis longus and brevis (weak) are common fibular nerve

49
Q

The tibial nerve is made up of fibers from?

A

L4-S3

50
Q

While still combine with the common fibular nerve, the tibial nerve fibers are sent to these muscles? (4)

A

Biceps femoris (long head)
semitendinosus
semimembranosus
Adductor Magnus (last 3 quads)

51
Q

Where does the tibial nerve give of articular, muscular, and popliteal branches?

A

Popliteal fossa

52
Q

The articular branches of the tibial nerve supply what?

A

Knee joint

53
Q

The muscular branches of the tibial nerve given off in the popliteal fosse supply what muscles? (4)

A

popliteus
Gastrocnemius
Soles
plantaris

54
Q

The popliteal branch of the tibial nerve gives rise to what nerve?

A

interosseous nerve of the leg

55
Q

The interosseous nerve of the leg travels inferiorly along what?

A

The interosseous membrane

56
Q

The interosseous nerve carries sensory information from where?

A

Tibial periosteum
Ankle
tibiofibular joints

57
Q

In the leg, the tibial nerve gives rise to what?

A

Muscular and sensory (medial calcaneal branches) branches

58
Q

The muscular branches given off by the tibial nerve in the leg supply what muscles?

A

Flexor digitorum longus
Flexor hallucis longus
Tibialis posterior

59
Q

The sensory branches given off in the leg by the tibial nerve are called what?

A

Medial calcaneal branches

60
Q

The medial calcaneal branches supply what?

A

Skin over the medial heel

61
Q

The tibial nerve after traveling inferior in leg travels around what?

A

Medial malleolus

62
Q

The tibial nerve travels around the medial malleolus to what?

A

Plantar surface of the foot

63
Q

Once the tibial nerve reaches the plantar surface of the foot, it divides into two terminal branches called?

A

Medial plantar nerve

Lateral plantar nerve

64
Q

The medial plantar nerve sends motor fibers to what muscles?

A

Abductor hallucis
Flexor digitorum brevis
Flexor hallucis brevis

65
Q

The medial plantar nerve divides into what?

A

Common plantar digital nerves

66
Q

The common plantar digital nerves are motor supply to what?

A

lumbricals 1 and 2

67
Q

The common plantar digital nerves are sensory supply to what?

A

Skin between the toes

68
Q

The skin between the toes sensory supply is by way of what nerves?

A

Proper plantar digital nerves

69
Q

The lateral plantar nerve divides into what?

A

Superficial and deep branches

70
Q

The superficial branch supplies what?

A

Skin around the 5th digit (baby toe)

71
Q

The deep branch supplies motor fibers to what? (6)

A 
Adductor hallucis
Flexor digiti minimi brevis
Abductor digiti Minami
Quadratus plantar
Lateral lumbricals
interossei muscles
72
Q

What are some clinical considerations with the tibial nerve?

A

Flexor paralysis
Hammer toes***
claw foot

73
Q

What is claw foot and hand?

A

Extension of proximal joints

Flexion of DIP and PIP joints

74
Q

The coccygeal plexus if formed by what?

A

The anterior primary ram of S4, S5, Co1 nerves

75
Q

The nerves of the coccygeal plexus combine to form what?

A

anococcygeal nerves

76
Q

The anococcygeal nerves supply what?

A

Sensory info from the skin adjacent to the coccyx and angus.

PNS exam III - mine (12 decks)

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