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PNS > Exam 3: Sacral Plexus > Flashcards

Exam 3: Sacral Plexus Flashcards

1
Q

Sacral plexus formed by

A

Anterior primary rami of L4, L5, S1-3 and part of S4

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2
Q

L4 and L5 contributions are by way of

A

Lumbosacral trunk

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3
Q

Sacral plexus forms anterior to

A

Piriformis muscle

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4
Q

Nerve roots forming sacral plexus divide into

A

Anterior and posterior divisions

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5
Q

Branches of the anterior divisions

A

N to obturator interior and superior gemellus
N to quadratus femoris and inferior gemellus
Pudendal N
To coccygeus and levator ani
Tibial N

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6
Q

Nerves formed by posterior divisions

A 
Superior gluteal
Inferior gluteal
N to piriformis
Perforating cutaneous N
Common fibular N
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7
Q

N to quadratus femoris and gemellus inferior contains fibers from

A

L4, L5, S1

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8
Q

N to quadratus femoris and gemellus inferior leaves pelvis through

A

Greater sciatic foramen

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9
Q

Quadratus femoris and gemellus inferior contribute to

A

Lateral rotation and adduction of thigh

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10
Q

N to obturator internus and gemellus superior contains fibers from

A

L5, S1, S2

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11
Q

N to obturator internus and gemellus superior leaves pelvis through ___ and gives off branches to ____

A

Greater sciatic foramen; gemellus superior

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12
Q

N to obturator internus and gemellus superior re-enters pelvis via ____ to supply ____

A

Lesser sciatic foramen; obturator internus

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13
Q

Obturator internus and gemellus superior contribute to

A

Lateral rotation and abduction of thigh

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14
Q

Pudendal N contains fibers from

A

S2, 3, 4

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15
Q

Pudendal N leaves pelvic cavity through ___, arches around ischial spine and into perineum via ____

A

Greater sciatic foramen; lesser sciatic foramen

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16
Q

Pudendal N travels in the ____, to reach dorsal side of _____/____

A

Pudendal canal; penis/clitoris

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17
Q

Branches off of pudendal N in pudendal canal

A

Inferior rectal N
Perineal N
Dorsal N of penis/clitoris

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18
Q

Inferior rectal N carries sensory info from

A

Skin around anus

Inferior 2/3 of anal canal

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19
Q

Inferior rectal nerves motor supply to

A

External anal sphincter

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20
Q

Perineal N divides into

A

Deep and superficial branches

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21
Q

Deep branches of pudendal N supply

A

External anal sphincter
Bulbospongiosus
Ischiocavernosus
Superficial transverse perineus

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22
Q

Superficial branches of pudendal N supply in males

A

posterior scrotum
urethral musoca
bulb of penis

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23
Q

Superficial branches of pudendal N supply in females

A

Labium majus
External urethral orifice
Vestibule

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24
Q

Terminal branch of pudendal N

A

Dorsal nerve of penis/clitoris

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25
Q

Dorsal N of penis/clitoris motor supply

A

Deep transverse perineus

Urethral sphincter muscles

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26
Q

Dorsal N of penis sensory supply in males

A

Corpus cavernosum
Glans penis
Skin covering penis

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27
Q

Dorsal N of clitoris sensory supply in females

A

Corpus cavernosum

Clitoris

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28
Q

Muscular branches containing fibers from S4 supply

A

Levator ani

Coccygeus

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29
Q

N to piriformis carries fibers from ____ to supply ____

A

S1 and S2

Piriformis

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30
Q

Superior gluteal N is made up of fibers from

A

L4, L5, S1

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31
Q

Superior gluteal N leaves pelvis through greater sciatic foramen, superior to ____ and splits into

A

Piriformis; superior and inferior branches

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32
Q

Superior branches of superior gluteal N supply

A

Gluteus medius and minimus

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33
Q

Inferior branches of superior gluteal N supply

A

Gluteus medius, minimis and tensor fascia lata

34
Q

Inferior gluteal N carries fibers from

A

L5, S1, S2

35
Q

Inferior gluteal N leaves pelvis through grater sciatic foramen, inferior to ___ and innervates ____

A

Piriformis; gluteus maximus

36
Q

The perforating cutaneous N contains fibers from

A

S2 and S3

37
Q

Perforating cutaneous N travels through ___, ultimately reaching ___

A

Sacrotuberous lig

Lower medial buttocks

38
Q

Nerves formed by both anterior and posterior divisions of sacral plexus

A

Posterior cutaneous N of thigh

Sciatic N

39
Q

Posterior cutaneous N of thigh formed by fibers from anterior divisions of ____ and posterior divisions of ____

A

S2 and S3

S1 and S2

40
Q

Largest N in human body

A

Sciatic N

41
Q

Sciatic N is a combination of two nerves

A

Tibial N medially

Common fibular N laterally

42
Q

Tibial N formed from anterior divisions of

A

L4-S3

43
Q

Common fibular N formed from posterior divisions of

A

L4-S2

44
Q

Sciatic N leaves pelvis through sciatic foramen, below

A

Piriformis muscle

45
Q

Sciatic N travels inferior on posterior aspect of

A

Adductor magnus

46
Q

2/3 of way down to knee sciatic N

A

Splits into common fibular and tibial N

47
Q

Common fibular gives off one branch to ___ in the thigh

A

Biceps femoris (short head)

48
Q

Common fibular N courses around ____ and gives off articular branch to ____

A

Lateral aspect of fibula; knee

49
Q

2 sensory branches given off along lateral aspect of popliteal fossa

A

Lateral sural cutaneous N

Fibular communicating branch

50
Q

Lateral sural cutaneous N supplies

A

Skin on lateral aspect of leg

51
Q

Fibular communicating branch forms sural N after combining w/

A

Medial sural cutaneous N

52
Q

Common fibular N divides into

A

Superficial and deep fibular N

53
Q

Superficial fibular N travels inferior btw _____ down to dorsum of foot

A

Fibularis longus and fibula

54
Q

Superficial fibular N supplies these muscles in lateral compartment of leg

A

Fibularis longus

Fibularis brevis

55
Q

Superficial fibular N splits into ________ in the foot

A

Medial and intermediate dorsal cutaneous N

56
Q

Medial and intermediate dorsal cutaneous nerves supply

A

Skin over dorsum of foot EXCEPT for between first two toes

57
Q

Deep fibular N runs inferiorly along ___ to reach dorsum of foot

A

Tibialis anterior

58
Q

Deep fibular N supplies these muscles

A

Tibialis anterior
Extensor digitorum longus/brevis
Extensor hallicis longus/brevis
Fibularis tertius

59
Q

Deep fibular N terminal branch supplies

A

Skin btw first two toes

60
Q

Steppage gait (foot drop)

A

Unable to lift big toe

Foot slap

61
Q

While tibial N is still combined w/ common fibular N, branches are sent to

A

Biceps femoris (long head)
Senitendinosus
Semimembranosus
Adductor magnus

62
Q

In popliteal fossa, tibial N gives off articular branches to

A

Knee

63
Q

In popliteal fossa, tibial N gives off muscular branches to

A

Popliteus
Gastrocnemius
Soleus
Plantaris

64
Q

Tibial N supplies muscles that are in ____ compartment

A

Superficial posterior

65
Q

The popliteal branch travels inferior to give rise to

A

Interosseous N of leg

66
Q

Interosseous N of leg continues inferior along

A

Posterior surface of interosseous membrane

67
Q

Interosseous N of leg carries sensory info from

A

Tibial periosteum
Ankle
Tibiofibular joints

68
Q

The tibial nerve gives rise to _______ branches in the leg that supply:

A

Muscular

  1. Flexor digitorum longus
  2. Flexor hallucis longus
  3. Tibialis posterior
69
Q

Sensory branches of the tibial nerve in the leg are called _____ and supply skin _______

A

Medial Calcaneal branches

Skin over the medial heel

70
Q

Before branching into it’s terminal branches, the tibial nerve travels

A

Around the medial malleolus to the plantar surface of the foot

71
Q

Terminal branches of tibial nerve

A

Medial plantar nerve and lateral plantar nerve

72
Q

Medial plantar nerve sends _____ fibers to:

A

Motor

  • ABductor hallucis
  • Flexor digitorum brevis
  • Flexor hallucis brevis
73
Q

Medial plantar nerve divides into

A

Common plantar digital nerves

74
Q

Common plantar digital nerves supply

A
  • Motor supply to 1st lumbrical

- Sensory to skin between toes via proper plantar digital nerves

75
Q

Lateral plantar nerve divides into

A

Superficial (sensory) and deep (motor) branches

76
Q

Superficial branch of lateral plantar nerve supplies

A

Skin around the 5th digit

77
Q

Deep branch of lateral plantar nerve supplies

A
  1. ADductor hallucis
  2. Flexor digiti minimi brevis
  3. ABductor digiti minimi
  4. Quadratus plantae
  5. Lateral lumbricals (2,3,4)
  6. All interossei muscles
78
Q

Flexor paralysis

A

Indicates damage to tibial nerve

79
Q

Hammer toes

A

Chronic overactivity of tibial nerve. Tendons for the toe flexors shorten

80
Q

Coccygeal plexus if formed by

A

Anterior rami of S4, S5, and Co1

81
Q

Coccygeal plexus gives rise to _______ nerves that carry sensory information to:

A

Anococcygeal nerves

Sensory info from skin adjacent tot coccyx and anus

PNS (24 decks)

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