Lumbosacral Plexus Flashcards Preview

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Flashcards in Lumbosacral Plexus Deck (9)
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Components: L1-5 and S1-4 ventral primary rami of the spinal nerves

Lumbosacral plexus

1

6 major terminal branches

Femoral nerve (L2,3,4)

Obturator nerve (L2,3,4)

Superior gluteal nerve (L4,5,S1)

Inferior gluteal nerve (L5,S1,S2)

Common peroneal nerve (L4,5,S1,2)
- divides into superficial & deep peroneal nerves

Tibial nerve (L4,5,S1,2,3)
- combines with common peroneal nerve to make up the sciatic nerve

2

Most common injury affecting the lumbosacral plexus

Herniation of intervertebral disk

3

Anterior compartment of thigh:
- quadriceps
- femoris
- sartoris
- pectineus

Action: extend knee

Femoral nerve (L2,3,4 posterior divisions)

4

Medial compartment of thigh:
- gracious
- adductor longus & brevis
- anterior portion of adductor magnus

Action: adduct thigh, medially rotate thigh

Obturator nerve (L2,3,4 anterior divisions)

5

Posterior compartment of thigh: (flex knee, extend knee)
- semimembranous
- semitendinosus
- long head of biceps femoris
- posterior portion of adductor magnus

Posterior compartment of leg: (plantar flex foot, flex digits, inversion)
- gastrocnemius
- soleus
- flexor digitorum longus
- flexor hallucis longus
- tibialis posterior

Tibial nerve (L4,5,S1,2,3, anterior divisions)

6

Short head of biceps femoris

Action: flex knee

Common peroneal (fibular) nerve (L4,5,S1,2, posterior divisions)

7

Lateral compartment of leg:
- peroneus longus & brevis

Action: eversion

Superficial peroneal (fibular) nerve

8

Anterior compartment of leg:
- tibialis anterior
- extensor hallucis
- extensor digitorum
- peroneus tertius

Action: dorsiflex foot, extend digits, inversion

Deep peroneal (fibular) nerve