Muscle
Quadratus femoris
Short posterior hip muscle linking ischium and femur
High-yield
Its named nerve also usually supplies inferior gemellus. The femoral attachment lies along the intertrochanteric crest region, distinguishing it from rotators that converge farther upward on the greater trochanter.
Overview
Quadratus femoris spans from the outer edge of the ischial tuberosity to the back of the proximal femur. Its broad, roughly rectangular form lies below the gemelli and helps turn the thigh outward.
Reference facts
- Origin
- Lateral border of the ischial tuberosity
- Insertion
- Quadrate tubercle and adjacent quadrate line along and below the intertrochanteric crest
- Action
- Externally rotates the hip, assists adduction and contributes to hip stability
- Innervation
- Nerve to quadratus femoris, conventionally L4-S1
- Blood supply
- Medial circumflex femoral and inferior gluteal branches
Frequently asked questions
What does the quadratus femoris do?
The quadratus femoris externally rotates the hip, assists adduction and contributes to hip stability.
What nerve innervates the quadratus femoris?
The quadratus femoris is innervated by the nerve to quadratus femoris, conventionally L4-S1.
Where does the quadratus femoris attach?
Origin: Lateral border of the ischial tuberosity. Insertion: Quadrate tubercle and adjacent quadrate line along and below the intertrochanteric crest.
What is the blood supply of the quadratus femoris?
Medial circumflex femoral and inferior gluteal branches.