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Anatomy 390 Nervous System > Sacral Plexus > Flashcards

Sacral Plexus Flashcards

1
Q

General knowledge

A

Formed by L5-6, S1-4
Supply lower back, pelvis, post surface of thigh and leg, dorsal and plantar surfaces of foot
Sciatic - broadest n in the body (~2cm)

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2
Q

N to quadratic femoris and gemellus inf

A

Ventral rami: L4-5, S1

Distribution: quadratic femoris and gemellus inf

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3
Q

N to obturator internus and gemellus sup

A

Ventral rami: L5, S1-2

Distribution: obturator internus and gemellus sup

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4
Q

N to piriformis

A

Ventral rami: S1-2

Distribution: piriformis

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5
Q

Superior gluteal

A

Ventral rami: L4-5, S1

Distribution: gluteus minimus/medius, TFL

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6
Q

Inferior gluteal

A

Ventral rami: L5, S1-2

Distribution: gluteus maximus

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7
Q

Posterior femoral cutaneous

A

Ventral rami: S1-3

Distribution: skin on posterior surface of butt, thigh, and lower leg, perineum

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8
Q

*Pudendal

A

Ventral rami: S2-4
Distribution:
Skin - of perineum, external genitalia
Muscles - perineum

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9
Q

Sciatic

A

Ventral rami: L4-5, S1-3
Distribution: biceps femoris, semitendinosus, semimembranosus
Branches: tibial, sural, medial and lateral plantar
Knowledge: actually 2 nerves in common sheath - fibular & tibial. Fibular trifurcates into deep/superficial fibular & genicular. Tibia branches into med/lat plantar

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10
Q

*Tibial

A 
Branch of sciatic
Ventral rami: L4-5, S1-3
Distribution: 
Skin - plantar surface of heel 
Muscle - gastrocnemius, soleus, plantaris, flexor digitorum/hallucis longus, tiialis posterior, popliteus
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11
Q

Sural

A

Branch of sciatic/tibial
Ventral rami: L4-5, S1-3
Distribution: skin of posterior surface of leg

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12
Q

Medial and lateral plantar

A 
Branch of sciatic/tibial/sural
Ventral rami: L4-5, S1-3
Distribution:
Muscles - intrinsic foot muscles
Skin - sole of foot
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13
Q

Common fibular/peroneal

A

Branch of sciatic
Ventral rami: L4-5, S1-2
Distribution: skin around lateral knee

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14
Q

Deep fibular

A

Branch of sciatic/fibular
Ventral rami: L4-5, S1-2
Distribution:
Muscles - fibularis tertius, tibialis ant, extensor hallucis/digitorum longus/brevis
Skin - web space b/w great toe on dorsum of foot

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15
Q

Superficial fibular

A 
Branch of sciatic/fibular 
Ventral rami: L4-5, S1-2
Distribution:
Muscles - fibularis brevis/longus 
Skin - ant surface of leg and foot
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Anatomy 390 Nervous System (7 decks)

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