Muscle Actions (Lower Extremity)

36 terms by bloftis

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Gluteus Maximus

Extension and ER of femur, Extension of trunk (ADD of femur when hip in ABD)

Gluteus Medius

ABD and IR of femur, Extends femur when hip in flexion (lateral stability of the pelvis)

Gluteus Minimus

ABD and IR of femur (lateral stability of pelvis)

Piriformis

ER of femur w/ hip extended, IR of femur w/ hip flexed > 90 degrees; assists in ABD of femur

Quadratus Femoris

ER of femur

Tensor Fascia Lata

ABD and flexion of femur

Iliacus

Flexion of femur

Psoas Major

Flexion of fmeur, flexion and lateral bending of lumbar spine; assists in maintaining lumbar lordosis

Sartorius

Flexion, ABD and ER of femur @ the hip; Flex the knee, Medial rotation (IR) of the tibia

Pectineus

Flexion and ADD of femur, assists in IR of femur

Rectus Femoris

Extension of the knee, flexion of the femur @ the hip

Vastus Lateralis

Extension of the knee, lateral movement of patella

Vastus Medialis

Extension of the knee, medial movement of patella

Vastus Intermedius

Extension of the knee

Gracilis

ADD of femur @ hip; assists in flexiono f the knee and IR of tibia

ADDuctor Longus

ADD of femur @ hip; assists in flexion and IR of femur @ hip

ADDuctor Brevis

ADD of femur @ hip; assists in flexion and IR of femur @ hip

ADDuctor Magnus

ADD of femur @ hip; assists in extension and IR of femur @ hip

Biceps Femoris

Flexion of knee, Extension of hip, ER of tibia

Semimembranosus

Flexion of knee, extension of hip, IR of tibia

Semitendinosus

Flexion of knee, Extension of hip, IR of tibia

Popliteus

IR of tibia; ER of femur, flexion of knee

Tibialis Anterior

DF and inversion

Extensor Hallucis Longus

Extension of IP jt of big toe, DF ankle, assists in inversion

Extensor Digitorum Longus

Extension of IP and MTP jts and DF ankle

Peronieus Tertius

DF and eversion

Gastrocnemius

PF ankle, Flexion knee, Supination subtalar jt (NWB), controls Pronation subtalar (WB)

Soleus

PF ankle, Supination subtalar jt (NWB), controls Pronation subtalar (WB)

Plantaris

PF ankle

Flexor Digitorum Longus

Flexion of MTP and IP jts, PF ankle, assists inversion

Flexor Hallucis Longus

Flexion of MTP and IP jts of Big Toe, PF ankle, assists inversion

Tibialis Posterior

Inversion, PF ankle, Supination subtalar jt (during walking), controls Pronation of subtalar jt early stance phase

Peroneus Longus

Eversion, assists w/ PF

Peroneus Brevis

Eversion, assists w/ PF

Extensor Digitorum Brevis

Extension of MTP and IP jts of 2,3 and 4

Extensor Hallucis Brevis

Extension of MTP jt of Big toe

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