Quadratus lumborum muscle

Quadratus Lumborum Muscle

The Quadratus Lumborum Muscle (pronunciation: kwah-drah-tus lum-boh-rum) is a muscle of the posterior abdominal wall. It is the deepest abdominal muscle and commonly referred to as a back muscle.

Etymology

The term "Quadratus Lumborum" is derived from Latin, where "quadratus" means square and "lumborum" refers to the lumbar region of the back.

Anatomy

The Quadratus Lumborum Muscle originates from the iliolumbar ligament and the inner lip of the iliac crest. It inserts into the 12th rib and the transverse processes of the lumbar vertebrae. It is innervated by the anterior branches of the T12 and L1-L4 spinal nerves.

Function

The Quadratus Lumborum Muscle has several functions. It acts to flex the spinal column laterally, extends the lumbar spine, and helps to stabilize the 12th rib during respiration.

Related Terms

• Iliac crest
• Spinal nerves
• Respiration
• Lumbar vertebrae
• Iliolumbar ligament

See Also

• Muscles of the human body
• Anatomy of the human body

External links

• Medical encyclopedia article on Quadratus lumborum muscle
• Wikipedia's article - Quadratus lumborum muscle

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