LE Actions Flashcards by Alex Uding

Rectus Femoris

Extend knee

Assists iliopsoas to flex thigh

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Vastus Medialis

Extend knee

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Vastus Lateralis

Extend knee

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Vastus Intermedius

Extend knee

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Sartorius

Hip flexion, abduction, LR

Flex knee & assist knee in MR

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Tensor of Fascia Lata

Hip abduction, MR, flexion

Assists with knee extension

Tenses fascia lata

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Iliopsoas

Flexes hip

Assist in hip LR & abduction

With insertion fixed:
Bilaterally: flexes trunk on femurs, increases lumbar lordosis

Unilaterally: Assist in lateral flexion of trunk to same side

If trunk is stable, contributes to anterior shear of lumbar spine

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Pectineus

Hip adduction and flexion

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Adductor Longus

Hip adduction and flexion

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Adductor Brevis

Hip adduction and flexion

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Adductor Magnus

Hip adduction, flexion, extension

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Gracilis

Adduct hip

Assists in knee MR and flexion

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Obturator Externus

Hip LR

Assists hip adduction

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Gluteus Maximus

Hip extension, LR

Lower fibers: assist in hip add

Upper fibers:
Assists in abduction

Stabilize knee in extension through ITB insertion

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Gluteus Medius

Abduct hip

Anterior fibers: Hip MR and assist with hip flexion

Posterior fibers: Hip LR and assist with hip extension

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Gluteus Minimus

Hip abduction, MR

Assists with hip flexion

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Piriformis

Laterally rotate extended hip

Flex abducted hip

Assists hip extension

Stabilizes femoral head in acetabulum

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Superior Gemelli

Laterally rotate extended hip

Abduct flexed hip

Stabilize femoral head in acetabulum

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Inferior Gemelli

Laterally rotate extended hip

Abduct flexed hip

Stabilize femoral head in acetabulum

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Obturator Internus

Laterally rotate extended hip

Abduct flexed hip

Stabilize femoral head in acetabulum

Quadratus Femoris

Laterally rotate extended hip

Abduct flexed hip

Stabilize femoral head in acetabulum

Biceps Femoris Long Head

Knee flexion, LR

Hip extension

Assists in hip LR

Biceps Femoris Short Head

Knee Flexion and LR

Semitendinosus

Knee flex and MR

Extend hip

Assists in hip MR

Semimembranosus

Knee flex, MR Extend hip Assists in hip medial rotation

Gastrocnemius

Medial Head Talocrural plantar flexion Assists in knee flexion Subtalar joint inversion (supination) Lateral Head Talocrural plantar flexion Assists in knee flexion

Plantaris

Plantar flexion Assists in knee flexion

Soleus

Talocrural plantar flexion Subtalar joint inversion (supination)

Flexor Hallicus Longus

Great toe IP flexion Assists in MP flexion Plantar ankle flexion Foot Inversion

Flexor Digitorum Longus

Proximal and distal IP and MP Flexion of 2-5 digits Assists in plantar flexion of ankle and inversion of foot

Tibialis Posterior

Inversion Assists in ankle plantar flexion

Popliteus

NWB: MR of the tibia on the femur and knee flexion WB: LR femur on tibia and knee flex Helps reinforce posterior ligament of knee joint

Extensor Hallucis Longus

Great toe IP and MTP extension Assist in INV (foot)and DF (ankle)

Extensor Digitorum Brevis

Extend of MTP of 1-4 digits Assists in extension of IP joints 2-4

Tibialis Anterior

Ankle dorsiflexion Assists in Inversion

Extensor Digitorum Longus

Extend MTP joints Assists in extension of IP 2-5 DF and EV

Fibularis (Peroneus) Tertius

Ankle DF Foot Eversion

Extensor Hallucis Brevis

Great toe MTP Extension

Abductor Hallucis

Abduction of MTP of great toe Assists in flexion Assists in adduction of the forefoot

Adductor Hallucis

Adduction Assists in flexion of MTP of great toe

Abductor Digiti Minimi

Flexes 5th toe Assists with abduction

Interossei

PLANTAR (3) ADD 3-5th digits toward axial line through the 2nd digit Assists in MTP flexion Assist in extension of IP 3-5th DORSAL (4) Abduct 2-4th digits from axial line through the 2nd digit Assists in MTP flexion and extension of 2-4th IP

Fibularis (Peroneus) Longus

Eversion Assists in plantar flexion and depresses first metatarsal head

Fibularis (Peroneus) Brevis

Eversion Assists in plantar flexion

Flexor Digiti Minimi Brevis

Flexion of fifth

Flexor Digitorum Brevis

PIP Flexion Assists in flexion of 2-5th MTP

Quadratus Plantae

Modifies line of pull of the flexor digitorum longus tendons Assists in flexion of 2-5th digits

Lumbricals

MTP flexion Assists in IP 2-5th extension

Flexor Hallucis Brevis

Flexion of MTP of great toe