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11.3 -- Muscle Groups

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Term
Definition
Iliopsoas   Psoas Major, Iliacus  
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Psoas Major   Origin: Transverse Processes of Lumbar Vertebrae Insertion: Femur, trochanter Action: Flex thigh at hip, rotate laterally, flex trunk.  
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Iliacus   Origin: Iliac fossa and Sacrum Insertion: Femur, trochanter Action: Flex thigh at hip, rotate laterally, flex trunk  
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Gluteus Maximus   Origin: Iliac crest, sacrum, cocyx, aponeurosis of sacrospinalis Insertion: Iliotibial tract of fascia lata and superior lateral part of linea aspera (gluteal tuberosity) on femur Action: Extends thigh at hip join, lateral rotation  
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Gluteus Minimus and Medius   Origin: Ilium Insertion: Greater trochanter of femur Action: Thigh abduction at hip joint and medial rotation.  
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Tensor Fasciae Latae   Origin: Iliac crest Insertion: Tibia by IT tract Action: Flexes and abducts thigh  
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Piriformis   Origin: Anterior sacrum Insertion: Superior border of greater trochanter Action: Lateral rotation and abduction  
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Obturater internus   Origin: Inner surface of obturater foramen Insertion: medial surface of greater trochanter Action: Lateral rotation and abduction  
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Obturater Externus   Origin: Outer surface of obturator membrane Insertion: Depression inferior to greater trochanter Action: Lateral rotation and abduction  
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Superior gemmulus   Origin: Ischial spine Insertion: Medial surface of greater trochanter of femur Action: Lateral roation and abduction  
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Inferior Gemmulus   Origin: Ischial tuberosity Insertion: Medial surface of greater trochanter Action: Lateral rotation and abduction  
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Quadratus Femoris   Origin: Ischial tuberosity Insertion: Elevation on intertrocanteric crest (posteriro) Action: Lateral rotation and hip joint  
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