Along its superior aspect, the quadratus femoris is bordered by fat and the inferior gemellus along its inferior aspect, it is bordered by the adductor magnus. Along its anterior aspect, the quadratus femoris is bordered by the obturator externus muscle along its posterior aspect it is bordered by fat and the sciatic nerve (Fig. The fibers are more closely opposed along the femoral end of the muscle, are more loosely arranged, and have more interspersed fat along the ischial aspect. The muscle has a somewhat striated appearance, the fibers running along the horizontal (axial) plane. Its insertion is along the posterior medial aspect of the proximal femur along the quadrate tubercle of the posterior intertrochanteric ridge (Figs. Its origin is at the inferolateral margin of the ischium along the anterior portion of the ischial tuberosity just anterior to the origin of the hamstring tendons. The quadratus femoris muscle is situated along the posterior aspect of the hip joint and, as the name suggests, has a quadrangular, somewhat rectangular, appearance.
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