Muscles of Gluteal Region Flashcards
Gluteus Medius - Origin
- external surface of ilium between anterior and posterior gluteal lines
Gluteus Maximus - Origin
- ilium posterior to posterior gluteal line
- dorsal surface of sacrum and coccyx
- sacrotuberous ligament
Gluteus Medius - Innervation
- Superior Gluteal Nerve (L4, L5, S1)
Gluteus Maximus - Innervation
- Inferior Gluteal Nerve (L5, S1, S2)
Gluteus Maximus - Actions
- extends thigh and assists in lateral rotation
- steadies thigh and assists in rising from seated position
Gluteus Maximus - Insertion
- most fibers end in iliotibial tract, which inserts into lateral condyle of tibia
- some fibers insert on gluteal tuberosity of femur
Gluteus Medius - Insertion
- lateral surface of greater trochanter
Gluteus Minimus - Origin
- external surface of ilium between anterior and inferior gluteal lines
Gluteus Minimus - Insertion
- anterior surface of greater trochanter
Gluteus Minimus - Innervation
- Superior Gluteal Nerve (L4, L5, S1)
Gluteus Minimus - Action
- adducts and medially rotates thigh
- keep pelvis level when opposite leg is raised
Tensor fasciae latae - Origin
- ASIS
- anterior part of iliac crest
Tensor fasciae latae - Insertion
- iliotibial tract attaching to lateral condyle of tibia
Tensor fasciae latae - Innervation
Superior gluteal n. (L4,L5, S1)
Tensor fasciae latae - Action
Flexes thigh
Piriformis - Origin
- anterior surface of 2nd - 4th sacral segments
- superior margin of greater sciatic notch and sacrotuberous ligament
Piriformis - Insertion
Superior border of greater trochanter
Piriformis - Innervation
Branches of anterior rami of S1,S2
Piriformis - Action
- Laterally rotates extended thigh
- Abducts flexed thigh
- Steadies hip joint
Obtruator Internus - Origin
Obtruator membrane
Obtruator Internus - Insertion
Medial surface of greater trochanter
Obtruator Internus - Innervation
Nerve to obtruator internus (L5,S1)
Gluteus Medius - Action
- adduct and medially rotates thigh
- keeps pelvis level when opposite leg is raised
Gemelli Superior - Origin
Ischial spine
Obtruator Internus - Action
- Laterally rotates extended thigh
- Abducts flexed thigh
- Stabilizes hip joint
Gemelli Superior - Innervation
Nerve to obtruator Internus (L5,S1)
Gemelli Superior - Action
- Laterally rotates extended thigh
- Abducts flexed thigh
- Stabilizes hip joint
Gemelli Inferior - Origin
Ischial tuberosity
Gemelli Inferior - Insertion
Medial surface of greater trochanter
Gemelli Inferior - Innervation
Nerve to quadratus femoris (L5, S1)
Gemelli Superior - Insertion
Medial surface of greater trochanter
Quadratus Femoris - Origin
Lateral border of ischial tuberosity
Quadratus Femoris - Insertion
Quadrate tubercle on intertrochanter crest of femur and area inferior to it
Gemelli Inferior - Action
- Laterally rotates extended thigh
- Abducts flexed thigh
- Stabilizes hip joint
Quadratus Femoris - Action
- Laterally rotates thigh
- Stabilizes hip joint
Quadratus Femoris - Innervation
Nerve to quadratus femoris (L5,S1)
