Lower Limb Muscle Actions And Nerves With Roots

Front 1

Iliopsoas (main)

Back 1

HIP FLEXOR
Iliacus-Femoral n. (L2,3);
Psoas major and minor-Anterior rami (L1,2,3)

Front 2

Sartorius

Back 2

HIP FLEXOR/ KNEE FLEXOR/ MEDIALLY ROTATES TIBIA
Femoral n. (L2,3)

Front 3

Rectus Femoris

Back 3

HIP FLEXOR/ EXTENDS THE KNEE
Femoral n. (L2,3,4)

Front 4

Tensor Fascia Lata

Back 4

STABILZES KNEE AT EXTENSTION
Superior Gluteal n. (L4,5,S1)

Front 6

Gluteus maximus (1st proximal)

Back 6

EXTENSOR OF FLEXED FEMUR
Inferior gluteal n. (L5,S1,2)

Front 7

Semitendinosus (Hamstrings) 2nd distal

Back 7

HIP EXTENSORS/ FLEXES THE KNEE/ MEDIALLY ROTATES TIBIA
Sciatic n. (L5,S1,2) Tibial division

Front 8

Semimembranosus (Hamstrings) 2nd distal

Back 8

HIP EXTENSORS/ FLEXES KNEE/ MEDIALLY ROTATES TIBIA
Sciatic n. (L5,S1,2) Tibial division

Front 9

Biceps Femoris L.H. (Hamstrings) 2nd distal

Back 9

HIP EXTENSORS/ FLEX KNEE AND LATERALLY ROTATE TIBIA
Sciatic n. (L5,S1,2) Tibial division

Front 10

Adductor magnus (Hamstrings division) 2nd distal

Back 10

ADDUCTS HIP
Sciatic n. (L5,S1,2) Tibial division

Front 11

Gluteus medius

Back 11

HIP ABDUCTORS
Superior gluteal n. (L4,5,S1)

Front 12

Tensor Fascia Lata

Back 12

STABILIZES KNEE IN EXTENTION
Superior gluteal n. (L4,5,S1)

Front 13

Piriformis

Back 13

HIP ABDUCTORS
Nerve to piriformis (L5,S1,S2)

Front 14

Adductor longus

Back 14

HIP ADDUCTORS
Obturator n. (L2,L3,L4)

Front 15

Adductor brevis

Back 15

HIP ADDUCTORS
Obturator n. (L2,3,4)

Front 16

Adductor magnus (Adductor division)

Back 16

HIP ADDUCTORS
Obturator n. (L2,3,4)

Front 17

Gracilis

Back 17

HIP ADDUCTORS/ FLEXES KNEE
Obturator n. (L2,3)

Front 18

Pectineus

Back 18

HIP ADDUCTORS
Femoral n. (L2,3)

Front 19

Quadratus femoris

Back 19

LATERALLY ROTATES HIP
Nerve to quadratus femoris (L5,S1)

Front 20

Gluteus medius

Back 20

MEDIAL ROTATOR OF THIGH/
ABDUCTS HIP
Superior gluteal n. (L4,5,S1)

Front 21

Gluteus minimus

Back 21

ABDUCT FEMUR/ MEDIALLY ROTATES THIGH
Superior gluteal n. (L4,5,S1)

Front 22

Piriformis

Back 22

ABDUCT THE FLEXED FEMUR/
LATERALLY ROTATE THE EXTENDED FEMUR
Nerve to piriformis (L5,S1,2)

Front 23

Superior gemellus

Back 23

ABDUCT THE FLEXED FEMUR/
LATERALLY ROTATE THE EXTENDED FEMUR
Nerve to obturator internus (L5,S1)

Front 24

Obturator internus

Back 24

ABDUCT THE FLEXED FEMUR/
LATERALLY ROTATE THE EXTENDED FEMUR
Nerve to obturator internus (L5,S1)

Front 25

Inferior gemellus

Back 25

ABDUCT THE FLEXED FEMUR/
LATERALLY ROTATE THE EXTENDED FEMUR
Nerve to obturator internus (L5,S1)

Front 26

Quadratus femoris

Back 26

LATERALLY ROTATES FEMUR AT HIP JOINT
Nerve to obturator internus (L5,S1)

Front 27

Obturator externus

Back 27

LATERALLY ROTATES FEMUR AT HIP JOINT
Obturator n. (L3,4)

Front 28

S.H. Biceps femoris

Back 28

FLEXES KNEE/ LATERALLY ROTATES TIBIA
Sciatic n. (fibular division) (L5,S1,2)

Front 29

GASTROCNEMIUS

Back 29

FLEXES KNEE/ PLANTAR FLEXES FOOT @ ANKLE
Tibial n. (S1,2)

Front 30

Vastus medialis

Back 30

KNEE EXTENSORS
Femoral n. (L2,3,4)

Front 31

Vastus intermedius

Back 31

KNEE EXTENSORS
Femoral n. (L2,3,4)

Front 32

Vastus lateralis

Back 32

KNEE EXTENSORS
Femoral n. (L2,3,4)

Front 33

Extensor Hallucis Longus

Back 33

DORSI FLEXES THE GREAT TOE/ DORSI FLEXES FOOT @ANKLE
Deep fibular n. (L4,5)

Front 34

Tibialis Anterior

Back 34

DORSIFLEXES FOOT @ ANKLE
Deep fibular n. (L4,5)

Front 35

Fibularis tertius

Back 35

DORSIFLEXES FOOT @ ANKLE/ EVERTS FOOT
Deep fibular n. (L4,5)

Front 36

Extensor Digitorum Longus

Back 36

EXTENDS DIGITS 2-5 DORSIFLEXES FOOT @ ANKLE

Deep fibular n. (L4,5)

Front 37

Soleus

Back 37

PLANTAR FLEXES FOOT @ ANKLE
Tibial n. (S1,2)

Front 38

Plantaris

Back 38

ASSIST THE GASTROCNEMIUS/ FLEXIING THE KNEE AND PLANTAR FLEXING THE FOOT AT THE ANKLE
Tibial n. (S1,2)

Front 39

Flexor Hallucis Longus

Back 39

FLEXES THE GREAT TOE/ PLANTAR FLEXES FOOT @ ANKNLE
Tibial n. (S2,3)

Front 40

Flexor Digitorum Longus

Back 40

FLEXES DIGITS 2-5 AND PLANTAR FLEXES FOOT @ ANKLE
Tibial n. (S2,3)

Front 41

Tibialis posterior

Back 41

INVERTS & PLANTAR FLEXES FOOT @ ANKLE
Tibial n. (S2,3)

Front 42

Fibularis Longus

Back 42

EVERT AND PLANTAR FLEX FOOT @ ANKLE
Superficial fibular n. (L5,S1,2)

Front 43

Fibularis Brevis

Back 43

EVERT AND PLANTAR FLEX FOOT @ ANKLE
Superficial fibular n. (L5,S1,2)