Quadratus muscle

Quadratus Muscles

Quadratus lumborum muscle, a type of quadratus muscle. (Image from Gray's Anatomy)

The Quadratus Muscles are a group of muscles found in the human body. They are named for their quadrilateral shape. The group includes the Quadratus Lumborum, Quadratus Plantae, and Quadratus Femoris.

Quadratus Lumborum

The Quadratus Lumborum is a muscle of the posterior abdominal wall. It is the deepest abdominal muscle and commonly referred to as a back muscle. It is irregular and quadrilateral in shape and broader below than above.

Quadratus Plantae

The Quadratus Plantae (also known as flexor accessorius) is located in the foot. It is thin and quadrilateral, and its primary function is to aid the Flexor Digitorum Longus in flexing the second to fifth toes.

Quadratus Femoris

The Quadratus Femoris is a flat, quadrilateral skeletal muscle. Located on the posterior side of the hip joint, it is a strong external rotator and adductor of the thigh, but also plays a vital role in stabilizing the hip joint.

See Also

• Muscular System
• Human Anatomy
• Muscle Contraction

References

• Gray's Anatomy
• Anatomy of the Human Body