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36 terms

Muscle Actions (Lower Extremity)

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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