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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
When does the common fibular nerve give off branches to the biceps femoris (short head) in the thigh?
Before separating from the tibial nerve fibers
26
After separating from the tibial nerve, the common fibular nerve courses around the ____ aspect of what?
Lateral | fibula
27
The common fibula nerve gives off what type of branch and to where?
Articular | knee joint
28
What part of the leg doe the common fibular nerve reach when it gives off the articular branch to the knee joint?
antero-lateral aspect of the leg
29
When are two sensory branches given off by the common fibular nerve?
As the nerve courses along the lateral aspect of the popliteal fossa
30
What are the names of the two sensory branches of the common fibular nerve?
Lateral sural branch | Fibular communicating branch
31
The lateral sural branch supplies what area?
Skin on lateral aspect of leg
32
The fibular communicating branch combines with which nerve?
Medial sural cutaneous nerve
33
After the fibula communicating branch combines with the medial sural cutaneous nerve, it forms/becomes what nerve?
Sural nerve
34
The medial sural cutaneous nerve is from which nerve?
Tibial nerve
35
The common fibula nerve then divides what two nerves?
Superficial fibular nerve | Deep fibular nerve
36
The superficial fibular nerve travels inferior between what? All the way down to where?
fibularis longus Fibula dorsum of the foot
37
The superficial fibula nerve supplies what two muscles?
Fibularis longus | Fibularis brevis
38
The superficial fibular nerve divides into what?
Medial dorsal cutaneous nerve | Intermediate dorsal cutaneous nerve
39
The medial and intermediate dorsal cutaneous nerves supply what area together?
Dorsum of the foot EXCEPT the skin between the first two toes.
40
The deep fibular nerve runs inferiorly along what?
tibialis anterior
41
The deep fibular nerve supplies what basically?
Extension muscles of foot and toes
42
The deep fibular nerve supplies what muscles specifically? (6)
Tibialis anterior Extension digitorum longus and brevis Extension hallucis longus and brevis Fibularis tertius
43
The terminal branch of the deep fibular nerve supplies what area a skin?
Skin between first two toes
44
What is a clinical consideration for the superficial and deep fibular nerves?
Steppage gait
45
What is stoppage gait?
Foot drop, causing a high stepping
46
What supplies the anterior compartment of leg?
Deep fibular nerve
47
What supplies the lateral compartment of the leg?
Superficial fibular nerve
48
Does the tibial nerve supply ALL plantar flexors?
NO, because the fibularis longus and brevis (weak) are common fibular nerve
49
The tibial nerve is made up of fibers from?
L4-S3
50
While still combine with the common fibular nerve, the tibial nerve fibers are sent to these muscles? (4)
Biceps femoris (long head) semitendinosus semimembranosus Adductor Magnus (last 3 quads)
51
Where does the tibial nerve give of articular, muscular, and popliteal branches?
Popliteal fossa
52
The articular branches of the tibial nerve supply what?
Knee joint
53
The muscular branches of the tibial nerve given off in the popliteal fosse supply what muscles? (4)
popliteus Gastrocnemius Soles plantaris
54
The popliteal branch of the tibial nerve gives rise to what nerve?
interosseous nerve of the leg
55
The interosseous nerve of the leg travels inferiorly along what?
The interosseous membrane
56
The interosseous nerve carries sensory information from where?
Tibial periosteum Ankle tibiofibular joints
57
In the leg, the tibial nerve gives rise to what?
Muscular and sensory (medial calcaneal branches) branches
58
The muscular branches given off by the tibial nerve in the leg supply what muscles?
Flexor digitorum longus Flexor hallucis longus Tibialis posterior
59
The sensory branches given off in the leg by the tibial nerve are called what?
Medial calcaneal branches
60
The medial calcaneal branches supply what?
Skin over the medial heel
61
The tibial nerve after traveling inferior in leg travels around what?
Medial malleolus
62
The tibial nerve travels around the medial malleolus to what?
Plantar surface of the foot
63
Once the tibial nerve reaches the plantar surface of the foot, it divides into two terminal branches called?
Medial plantar nerve | Lateral plantar nerve
64
The medial plantar nerve sends motor fibers to what muscles?
Abductor hallucis Flexor digitorum brevis Flexor hallucis brevis
65
The medial plantar nerve divides into what?
Common plantar digital nerves
66
The common plantar digital nerves are motor supply to what?
lumbricals 1 and 2
67
The common plantar digital nerves are sensory supply to what?
Skin between the toes
68
The skin between the toes sensory supply is by way of what nerves?
Proper plantar digital nerves
69
The lateral plantar nerve divides into what?
Superficial and deep branches
70
The superficial branch supplies what?
Skin around the 5th digit (baby toe)
71
The deep branch supplies motor fibers to what? (6)
``` Adductor hallucis Flexor digiti minimi brevis Abductor digiti Minami Quadratus plantar Lateral lumbricals interossei muscles ```
72
What are some clinical considerations with the tibial nerve?
Flexor paralysis Hammer toes*** claw foot
73
What is claw foot and hand?
Extension of proximal joints | Flexion of DIP and PIP joints
74
The coccygeal plexus if formed by what?
The anterior primary ram of S4, S5, Co1 nerves
75
The nerves of the coccygeal plexus combine to form what?
anococcygeal nerves
76
The anococcygeal nerves supply what?
Sensory info from the skin adjacent to the coccyx and angus.

PNS exam III - mine (12 decks)

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