Musculature/Innervation Review of the Thigh PTA
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Psoas Major | Origin:bodies of discs of T12-L5. Insertion:lesser trocanter. Nerve:L2,3 Action:flexes and laterally rotates thigh at hip, flexes vertebral column (Torso)
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| Psoas Minor | Bodies of discs of T12 and L1.Insertion: pectinial line of superior pubic bone. Nerve: L2,3 Action:weak trunk flexer.
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| Iliacus | Origin:upper 2/3 Iliac fossa. Insertion:lessor trochantor.Nerve:L2-4. Action: flexes & laterally rotates thigh @ hip.
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| Pectinius | Origin: pubic ramus. Insertion: spiral line.Nerve Femoral. Action: adducts and flexes hip at thigh.
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| Iliopsoas | Origin:joining of Psoas Major and Iliacus. Insertion:lesser trochanter. Nerve:L2-4. Action: flexion of hip
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| Piriformis | Origin: anterior surface of sacrum. Insertion: greater trochanter. Nerve: sacral plexus. Action: lateraly rotates thigh at hip; also abducts thigh if hip is flexed.
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| Obturator Internus | Origin: inner surface of obturater membrane. Insertion: greater trochanter. Nerve: sacral plexus. Action: abducts & rotates laterally thigh,and stabiliser of the hip during walking.
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| Obturator Externus | Origin: outer surface of the obturator membrane. Insertion: greater trochanter. Nerve: Obturator. Action: adducts thigh, laterally rotates thigh.
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| Gemellus Superior | Origin: ischial spine. Insertion: greater trocantor. Nerve: sacral plexes. Action: rotates thigh laterally.
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| Gemellus Inferior | Origin: ischial tuberosity. Insertion: greater trochantor. Nerve: sacral plexus. Action: rotates thigh laterally.
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| Quadratus Femoris | Origin: ischial tuberosity. Insertion: quadrate tubercle of the femur. Nerve: sacral plexus.Action:laterally rotates and helps adduct the thigh at hip.
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| Gluteus Maximus | Origin: outer surface of Illium, sacrum and coccyx. Insertion: Iliotibial tract,gluteal tubercle of the femur. Nerve: inferior gluteal. Action: extends, laterally rotates thigh @ hip;helps abduct the thigh.
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| Gluteus Medius | Origin: outer surface of ilium. Insertion: greater trochanter. Nerve: superior gluteal. Action: Abducts thigh @ hip;anterior fibers medially rotate thigh;posterior fibers lateraly rotate hip @ thigh.
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| Gluteus Minimus | Origin: outer surface of ilium. Insertion: greater trochanter. Nerve: superior gluteal. Action: abducts thigh @ hip;anterior fibers medially rotate thigh.
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| Sartorius | Origin:anterior illiac spine. Insertion:just below medial condyle of tibia. Nerve:femoral. Action: flexes and laterally rotates thigh @ hip;also flexes leg @ knee.
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| Quadradus Femoris | Origin: just above ischial tuberosity. Insertion:tibial tuberosity. Nerve: femoral L5,S1. Action: lateral rotation and adduction of thigh.
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| Gracilis | Origin: pubic bone. Insertion: upper medial tibia. Nerve: obturator L3,L4(anterior branch). Action: adducts hip @ thigh,also flexes leg @ knee and medially rotates leg when knee is flexed.
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| Adducter Longus | Origin:pubic bone. Insertion: Linea Aspera. Nerve:Obturator (anterior branch)L3 L4. Action:adducts thigh and assists in lateral rotation.
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| Adductor Brevis | Origin: pubic bone. Insertion: Linea Aspera. Nerve: Obturator (anterior branch)L3 L4. Action: Adducts thigh and assists in lateral rotation.
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| Adductor Magnus | Origin: pubic bone. Insertion: linea aspera. Nerve: Sciatic (L2-L4), Obturator(L2-L4)Action: Oblique head, adducts and flexes thigh. Vertical head;extends thigh @ hip.
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| Tenser Fascia Latae | Origin: iliac crest. Insertion: iliotibial band. Nerve: sciatic-tibial. Action: abducts and flexes thigh @ hip.
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| Biceps Femoris | Origin: ichial tuberosity. Insertion: head of fibula,lateral condyle of tibia. Nerve: sciatic-tibial portion& common peroneal. Action: extends thigh @ hip. Flexes leg @ knee and laterally rotataes leg if knee is flexed.
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| Semi Membranosus | Origin: ischial tuberosity. Insertion: upper medial tibia. Nerve: Sciatic-Tibial portion L5,S1,S2. Action: Extends hip @ thigh.also flexes leg @ knee and medially rotates leg if knee is flexed.
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| Semitendinosus | Origin: ischial tuberosity. Insertion: upper medial Tibia. Nerve: Sciatic-Tibial portion,L5,S1,S2. Action: extends thigh @ hip. It also flexes leg @ knee and medially rotates leg if knee is flexed.
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