Gluteal Region OINAs
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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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