Sacral Plexus

Question 1

Nerve to Quadratus Femoris

Answer 1

L4-S1 (anterior divisions)

Motor Function: Quadratus femoris, inferior gemellus

Sensory Function: Hip joint

Question 2

Nerve to Obturator Internus

Answer 2

L5-S2 (anterior divisions)

Motor function: Obturator internus, superior gemellus

Question 3

Nerve to Piriformis

Answer 3

S1-S2 (posterior divisions)

Motor Function: Piriformis

Question 4

Superior Gluteal Nerve

Answer 4

L4-S1 (posterior divisions)

Motor Function: Gluteus medius, Gluteus minimus, Tensor fascia latae

Question 5

Inferior Gluteal Nerve

Answer 5

L5-S2 (posterior divisions)

Motor Function: Gluteus maximus

Question 6

Posterior Femoral Cutaneous Nerve

Answer 6

S1-S2 (post. div)
S2-S3 (ant. div)

Sensory Function: Skin over inferior buttock, posterior thigh, and popliteal fossa

Question 7

Sciatic: Tibial Nerve

Answer 7

L4-S3 (anterior divisions)

Motor Function: Semimembranosus, semitendinosus, long head of biceps femoris, hamstring portion of adductor magnus, posterior compartment of leg, and plantar foot

Sensory Function: Knee and ankle joints; skin over posterior leg (as medial sural nerve) and plantar foot (as lateral and medial plantar nerves)

Question 8

Sciatic: Common Fibular Nerve

Answer 8

L4-S2 (posterior divisions)

Motor Function: Short head of biceps femoris, lateral and anterior compartment of leg, and dorsal foot

Sensory Function: Knee joint; skin over lateral leg (as lateral sural nerve) and dorsum of foot (as superficial and deep fibular nerves)