Quadratus femoris (left) (Musculus quadratus femoris)
Educational content only — not medical advice.
Anatomy
A rectangular sheet between the ischial tuberosity and the intertrochanteric crest — the strongest lateral rotator of the hip; the medial circumflex femoral artery crosses its surface.
Origin & insertion
Lateral border of the ischial tuberosity.
Action
Powerfully laterally rotates the thigh and steadies it in single-leg stance.
Innervation
Nerve to quadratus femoris from the sacral plexus (L5–S1).
Clinical notes
The medial circumflex artery crossing it supplies most of the femoral head — injuring it in femoral-neck fracture means avascular necrosis; chronic strain is a deep gluteal pain in athletes.
Related structures
Educational references
FAQ
What is the role of the Quadratus femoris (left)?
A rectangular sheet between the ischial tuberosity and the intertrochanteric crest — the strongest lateral rotator of the hip; the medial circumflex femoral artery crosses its surface.
Why is the Quadratus femoris (left) clinically important?
The medial circumflex artery crossing it supplies most of the femoral head — injuring it in femoral-neck fracture means avascular necrosis; chronic strain is a deep gluteal pain in athletes.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details