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Gluteal Region OINAs

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Question
Answer
Gluteus Maximus Origin   External/gluteal surface of ilium, posterior surfaces of sacrum & sacrotuberous ligament.  
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Gluteus Maximus Insertion   Most fibers into iliotibial tract of the fascia lata, some fibers into gluteal tuberosity of femur.  
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Gluteus Maximus Action   Extension of thigh at hip, extension of trunk when the lower limbs are fixed, and lateral rotation of thigh at hip.  
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Gluteus Maximus Nerve   Inferior gluteal (L5, S1, S2).  
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Gluteus Maximus Blood   Primarily, inferior gluteal; some from superior gluteal.  
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Gluteus medius Origin   External/gluteal surface of ilium.  
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Gluteus medius Insertion   Lateral surface of greater trochanter of femur.  
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Gluteus medius Action   Abduction & medial rotation of thigh at hip. Stabilizes pelvis & prevents the free limb from sagging during walking.  
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Gluteus medius Nerve   Superior gluteal (L4, L5, S1)  
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Gluteus medius Blood   Superior gluteal.  
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Gluteus Minimus Origin   External/gluteal surface of ilium.  
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Gluteus Minimus Insertion   Anterior surface of greater trochanter of femur.  
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Gluteus Minimus Action   Abduction & medial rotation of thigh at hip joint. Stabilizes pelvis & prevents the free limb from sagging during walking.  
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Gluteus Minimus Nerve   Superior gluteal (L4, L5, S1)  
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Gluteus Minimus Blood   Superior gluteal.  
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Piriformis Origin   Anterior surface of 2nd, 3rd, & 4th sacral vertebrae lateral to the anterior sacral foramina.  
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Piriformis Insertion   After exiting pelvis through the greater sciatic foramen, it inserts onto the superomedial area of the greater trochanter.  
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Piriformis Action   Lateral rotation of thigh at hip, abduction of flexed thigh at hip, assists in holding femoral head in the acetabulum.  
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Piriformis Nerve   Ventral rami of S1 & S2  
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Piriformis Blood   Branches of internal iliac: Superior gluteal, inferior gluteal, & lateral sacral.  
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Superior gemellus Origin   Ischial spine.  
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Superior gemellus Insertion   Blends with tendon of obturator internus muscle as it inserts onto the medial area of greater trochanter.  
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Superior gemellus Action   Lateral rotation of thigh at hip, abduction of flexed thigh at hip, assists in holding femoral head in acetabulum.  
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Superior gemellus Nerve   Ventral Rami of L5, S1, S2 spinal nerves  
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Superior gemellus Blood   Inferior gluteal  
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Obturator internus Origin   Pelvic/internal surface of obturator membrane & bony margins or obturator foramen.  
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Obturator internus Insertion   After exiting pelvis through lesser sciatic foramen, it inserts onto the medial area of greater trochanter.  
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Obturator internus Action   Lateral rotation of thigh at hip, abduction of flexed thigh at hip, assists in holding femoral head in acetabulum.  
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Obturator internus Nerve   Ventral Rami of L5, S1, S2 spinal nerves  
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Obturator internus Blood   Inferior gluteal.  
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Inferior gemellus Origin   very, superior area of ischial tuberosity.  
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Inferior gemellus Insertion   Blends with tendon of obturator internus muscle as it inserts onto the medial area of greater trochanter.  
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Inferior gemellus Action   Lateral rotation of thigh at hip, abduction of flexed thigh at hip, assists in holding femoral head in acetabulum.  
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Inferior gemellus Nerve   ventral rami of L4, L5, & S1 spinal nerves  
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Inferior gemellus Blood   Inferior gluteal.  
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Quadratus femoris Origin   Superolateral aspect of ischial tuberosity.  
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Quadratus femoris Insertion   Quadrate tubercle on intertrochanteric crest of femur.  
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Quadratus femoris Action   Lateral rotation of thigh at hip, assists in holding femoral head in acetabulum.  
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Quadratus femoris Nerve   Ventral rami of L4, L5, S1 spinal nerves  
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Quadratus femoris Blood   Inferior gluteal.  
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