Muscles that act on the thigh Flashcards Preview

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Flashcards in Muscles that act on the thigh Deck (17):

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Gluteus maximus


Origin: dorsal ilium, sacrum, and coccyx

Insertion: gluteal tuberosity of femur, iliotibial tract


Major extensor of thigh; used when climbing stairs or running, generally inactive during standing and walking


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Gluteus medius


Origin: between anterior and posterior gluteal lines on lateral surface of ilium

Insertion: by short tendon into lateral aspect of greater trochanter of femut


Abducts and medially rotates thigh; extremely important in walking


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Gluteus minimus


Origin: between anterior and inferor gluteal lines on external surface of ilium

Insertion: anterior border of greater trochanter of femur


Same as gluteus maximus: major extensor of thigh; used in running and climbing but not walking


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Origin: anterolateral surface of sacrum (opposite greater sciatic notch)

Insertion: superior border of greater trochanter of femur


Rotates extended thigh laterally


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Quadratus femoris


Origin: ischial tuberosity

Insertion: intertrochanteric crest of femur


Rotates thigh laterally and stabilized hip joint


Two Iliopsoas

1. Iliacus

2. Psoas major


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Origin: iliac fossa, ala of sacrum

Insertion: lesser trochanter of femur via iliopsoas tendon


Prime mover in thigh flexion and in flexing truck (as when bowing)


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Psoas major


Origin: by fleshy slips from transverse processes, bodies, and discs of lumbar vertebrae and T12

Insertion: lesser trochanter of femur via iliopsoas tendon


Same as iliacus: primve mover in thigh flexion and flexing trunk (as in bowing); also causes lateral flexion of vertebral column


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Origin: Pectineal line of pubis (and superior ramus)

Insertion: a line from lesser trochanter to the linea aspera on posterior aspect of femur


Adducts, flexes and medially rotates thigh


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Adductor brevis


Origin: body and inferior ramus of pubis

Insertion: linea aspera above adductor longus


Adducts and medially rotates thigh


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Adductor longus


Origin: pubis near pubic symphysis

Insertion: linea aspera


Adducts, flexes, and medially rotates thigh


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Adductor magnus


Origin: ischia and pubic rami and ischial tuberosity

Insertion: linea aspera, media supracondylar line, and adductor tubercle of femur


Anterior part adducts and medially rotates and flexes thigh; posertior part is a synergist of hamstrings in thigh extension


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Origin: anterior superior iliac spine

Insertion: winds around medial aspect of knee and inserts into medial aspect of proximal tibia


Flexes, abducts, and laterally rotates thigh; flexes knee (weak) as in soccer kick, helps you sit cross-legged


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Rectus femoris


Origin: anterior inferior iliac spine and superior margin of acetabulum

Insertion: patella and tibial tuberosity via patellar ligament


Extends knee and flexes thigh at hip


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Origin: ischial tuberosity

Insertion: medial condyle of tibia; through oblique ligament to lateral condyle of femur


Extends thigh and flexes knee; medially rotates knee


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Origin: ischia tuberosity in common with long head of biceps femoris

Insertion: medial aspect of upper tibial shaft


Extends thigh at hip; flexes knee; with semimembranosus, medially rotates leg


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Long head of Biceps femoris


Origin: ischial tuberosity

Insertion: common tendon passes downward and laterally to insert into head of fibula and lateral condyle of tibia


Extends knee and flexes knee; laterally rotates leg, especially when knee is fixed