Lower Extremity Muscles

Question 0

Rectus femoris

Answer 0

O: AIIS

I: tibial tuberosity

A: hip flexion, knee extension

N: femoral nerve (L2, L3, L4)

Question 1

Adductor longus

Answer 1

O: pubis

I: middle 3rd of linea aspera

A: hip ADD

N: obturator nerve (L3,L4)

Question 2

Adductor Magnus

Answer 2

O: ischium and pubis

I: entire linea aspera & adductor tubercle

A: hip ADD

N: obturator & sciatic nerve (L3, L4)

Question 3

Adductor brevis

Answer 3

O: pubis

I: pectineal line & proximal linea aspera

A: hip ADD

N: obturator nerve (L3, L4)

Question 4

Vastus lateralis

Answer 4

O: linea aspera

I: tibial tuberosity

A: knee extension

N: femoral nerve (L2, L3, L4)

Question 5

Vastus intermedialis

Answer 5

O: anterior femur

I: tibial tuberosity via patellar tendon

A: knee extension

N: femoral nerve (L2, L3, L4)

Question 6

Vastus medialis

Answer 6

O: linea aspera

I: tibial tuberosity via patellar tendon

A: knee extension

N: femoral nerve (L2, L3, L4)

Question 7

Semimembranosus

Answer 7

O: ischial tuberosity

I: posterior surface of medial condyle of tibia

A: extend hip, flex knee

N: sciatic nerve (L5, S1, S2)

Question 8

Semitendinosus

Answer 8

O: ischial tuberosity

I: anteriormedial surface of proximal tibia

A: extend hip, flex knee

N: sciatic nerve (L5, S1, S2)

Question 9

Biceps femoris

Answer 9

O: long head: ischial tuberosity
Short head: lateral lip of linea aspera

I: fibular head

A: long head: extend hip, flex knee
Short head: flex knee
N: long head: sciatic (S1, S2, S3)
Short head: common peroneal (L5, S1, S2)

Question 10

Popliteus

Answer 10

O: lateral condyle of femur

I: posterior medial condyle of tibia

A: initiates knee flexion

N: tibial nerve (L4, L5, S1)

Question 11

Gluteus minimus

Answer 11

O: lateral ilium

I: anterior surface of greater trochanter

A: Hip ABD, MR

N: superior gluteal nerve (L4, L5, S1)

Question 12

Gluteus medius

Answer 12

O: outer surface of ilium

I: lateral surface of greater trochanter

A: Hip ABD

N: superior gluteal nerve (L4, L5, S1)

Question 13

Gluteus Maximus

Answer 13

O: posterior sacrum & ilium

I: posterior femur distal to greater trochanter & ITB

A: hip extension, hyper extension, LR

N: inferior gluteal nerve (L5, S1, S2)

Question 14

Iliopsoas

Answer 14

O: iliac fossa, anterior & lateral surfaces of T12 through L5

I: lesser trochanter

A: hip flexion

N: iliacus portion: femoral nerve (L2, L3)
Psoas major portion: (L2, L3) lumbar nerve

Question 15

Sartorius

Answer 15

O: ASIS

I: proximal medial aspect of tibia (PAM)

A: combination of hip flexion, abdication, LR, & knee flexion

N: femoral nerve (L2, L3)

Question 16

Pectineus

Answer 16

O: superior ramus of pubis

I: pectineal line of femur

A: hip flexion & ADDuction

N: femoral (L2, L3, L4)

Question 17

Gracilis

Answer 17

O: pubis

I: anterior medial surface of proximal end of tibia (PAM-T)

A: hip ADDuction

N: obturator (L2, L3)

Question 18

TFL

Answer 18

O: ASIS

I: lateral condyle of tibia

A: combined flexion & ABD

N: superior gluteal (L4, L5)

Question 19

Tibialis anterior

Answer 19

O: lateral tibia & interoseous membrane

I: 1st cuneiform & 1st metatarsal

A: ankle inversion & dorsiflexion

N: deep peroneal nerve (L4, L5, S1)

Question 20

Tibialis posterior

Answer 20

O: interoseous membrane, adjacent tibia and fibula

I: navicular & most tarsals and metatarsals

A: ankle inversion, assists in plantar flexion

N: tibial nerve (L5, S1)