Lower Extremity Anatomy

Question 1

Muscles innervated by the proximal SCIATIC nerve

Answer 1

biceps femorii
semitendinosus
adductor magnus
semimembranosus

Question 2

Muscles innervated by the TIBIAL nerve

Answer 2

Gastroc/Soleus/Plantaris/Popliteus
Tibialis posterior
FDL / FHL
Abductor hallucis, lumbricals, most foot muscles
FDB / FHB

Question 3

Muscles innervated by the COMMON PERONEAL nerve

Answer 3

Peroneal longus/brevis/tertius
Tibialis anterior
EDL, EHL, EDB

Question 4

Muscles innervated by the SUPERFICIAL PERONEAL nerve

Answer 4

peroneus longus
peroneus brevis

(SPN nerve roots L4-S1)

Question 5

Muscles innervated by the DEEP PERONEAL nerve

Answer 5

tibialis anterior
EHL
EDL
peroneus tertius, terminal EHB/EDB

(DPN nerve roots L4-L5)

Question 6

Muscles innervated by the MEDIAL PLANTAR nerve

Answer 6

ABDuctor hallucis
FDB / FHB
1st lumbrical

Question 7

Muscles innervated by the LATERAL PLANTAR nerve

Answer 7

QUADratus plantae
ADDuctor hallucis
FDM, ABDuctor DM, interossei, lateral 3 lumbricals

Question 8

Which nerves exit below the PIRIFORMIS?

Answer 8

"POP'S IQ"
P - Pudendal (L4-S2)
O - Obturator internus (L5-S2)
P - Posterior femoral cutaneous (S1-S3)
S - Sciatic (L4-S3)
I - Inferior gluteal (L5-S2)
Q - Quadratus femoris (L4-S1)

Question 9

The SCIATIC nerve is composed of which nerve roots?

Answer 9

L4 to S3

Question 10

Muscles innervated by the OBTURATOR nerve

Answer 10

GO AAA
G - Gracilis
O - Obturator EXTERNUS
A - ADDuctor Longus + Brevis + Magnus

(nerve roots L2-L4)

Question 11

What is the most important predictor of residual patellofemoral instability after isolated medial patellofemoral ligament reconstruction?

Answer 11

severe trochlear dysplasia