Gluteal region Flashcards
Origin of gluteus maximus muscle
Behind posterior gluteal line
Fascia of the gluteus medius and erector spinae muscles
Dorsal surface of the sacrum
Lateral margin of the coccyx
Sacrotuberous ligament
Insertion of gluteus maximus muscle
Posterior aspect of iliotibial tract
Gluteal tuberosity of proximal femur
Innervation of gluteus maximus muscle
Inferior gluteal nerve (L5 – S2)
Action of gluteus maximus muscle
Hip extension
Lateral rotation
Abduction
Laterally stabilizes hip and knee joint
Origin of gluteus medius muscle
External surface of the ilium
- Between anterior and posterior gluteal lines
Insertion of gluteus medius muscle
Lateral surface of the greater trochanter
Action of gluteus medius muscle
Abduction and medial rotation
Maintain horizontal pelvic plane
Innervation of gluteus medius muscle
Superior gluteal nerve (L4 – S1)
Origin of gluteus minimus muscle
External surface of the ilium
- Between anterior and inferior gluteal lines
Insertion of gluteus minimus muscle
Anterolateral surface of greater trochanter
Action of gluteus minimus muscle
Abduction and medial rotation
Maintain horizontal pelvic plane
Innervation of gluteus minimus muscle
Superior gluteal nerve (L4 – S1)
Origin of piriformis muscle
Anterior surface of the sacrum
Insertion of piriformis muscle
Through greater sciatic foramen
- Superomedial surface of greater trochanter
Action of piriform muscle
Lateral rotation
Innervation of piriform muscle
Nerve to Piriformis (Anterior rami of S1 – S2)
Origin of obturator internus muscle
Medial aspect of pelvic anterolateral wall
- Obturator membrane and surrounding bones
Insertion of obturator internus muscle
Through lesser sciatic foramen
- Upper medial aspect of greater trochanter
Action of obturator internus muscle
Lateral rotation when hip is extended
- Abducts when flexed
Innervation of obturator internus muscle
Nerve to obturator internus (L5 – S1)
Origin of superior and inferior gemellus muscles
Superior – External of ischial spine
Inferior – Superior aspect of ischial tuberosity
Insertion of superior and inferior gemellus muscles
Tendons fuse to insert with obturator internus
Action of superior and inferior gemellus muscles
Lateral rotation when hip is extended
- Abducts when flexed
Innervation of superior and inferior gemellus muscles
Superior gemellus muscle
- Nerve to obturator internus (L5 – S1)
Inferior gemellus muscle
- Nerve to quadratus femoris (L5 – S1)
Origin of quadratus femoris muscle
Lateral surface of the ischium
- Anterior to ischial tuberosity
Insertion of quadratus femoris muscle
Quadrate tubercle on the intertrochanteric crest
Action of quadratus femoris muscle
Lateral rotation
Innervation of quadratus femoris muscle
Nerve to quadratus femoris (L5 – S1)
Origin of obturator externus muscle
External surface of the obturator membrane
Adjacent bones
Insertion of obturator externus muscle
Pass oblique inferior to femoral neck
- Trochanteric fossa
Action of obturator externus muscle
Lateral rotation
Innervation of
