Quadratus femoris muscle

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Quadratus femoris muscle
The quadratus femoris and nearby muscles
Muscles of the gluteal and posterior femoral regions with quadratus femoris muscle highlighted
Latin musculus quadratus femoris
Gray's subject #128 477
Origin Ischial tuberosity
Insertion    Intertrochanteric crest
Artery: Inferior gluteal artery
Nerve: Nerve to quadratus femoris (L4-S1)
Action: lateral rotation of thigh

The quadratus femoris is a flat, quadrilateral muscle, between the gemellus inferior and the upper margin of the adductor magnus; it is separated from the latter by the terminal branches of the medial femoral circumflex vessels.

It arises from the upper part of the external border of the tuberosity of the ischium, and is inserted into the upper part of the linea quadrata—that is, the line which extends vertically downward from the intertrochanteric crest.

A bursa is often found between the front of this muscle and the lesser trochanter. Sometimes absent.

The primary action of quadratus femoris is external or lateral rotation of the hip, it also acts to steady the femoral head in the acetabulum.

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External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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