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Gluteal Region OINA

Gluteal Region OINAs

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